Remove pytest.ini to remove test warning

[zpoint]

We got many warning when running pytest now:

Its likely introduced by pytest.ini from #5328

We use pyproject.toml for pytest option before, and the same config already added in #5348

These two might have conflict.

======================================================================= warnings summary =======================================================================
--
  | tests/smoke_tests/test_basic.py:74
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:74: DeprecationWarning: invalid escape sequence '\$'
  | f'sky exec {name} "prlimit -n --pid=\$(pgrep -f \'raylet/raylet --raylet_socket_name\') \| grep \'"\'1048576 1048576\'"\'"',
  |  
  | tests/smoke_tests/smoke_tests_utils.py:335
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/smoke_tests_utils.py:335: DeprecationWarning: invalid escape sequence '\.'
  | ' \| grep -q "eks\.amazonaws\.com"'
  |  
  | tests/smoke_tests/test_basic.py:43
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:43: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast  #requires GCP and AWS set up
  |  
  | tests/smoke_tests/test_basic.py:44
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:44: PytestUnknownMarkWarning: Unknown pytest.mark.no_fluidstack - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_fluidstack  #requires GCP and AWS set up
  |  
  | tests/smoke_tests/test_basic.py:129
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:129: PytestUnknownMarkWarning: Unknown pytest.mark.no_fluidstack - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_fluidstack
  |  
  | tests/smoke_tests/test_basic.py:130
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:130: PytestUnknownMarkWarning: Unknown pytest.mark.no_lambda_cloud - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_lambda_cloud
  |  
  | tests/smoke_tests/test_basic.py:131
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:131: PytestUnknownMarkWarning: Unknown pytest.mark.no_ibm - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_ibm
  |  
  | tests/smoke_tests/test_basic.py:132
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:132: PytestUnknownMarkWarning: Unknown pytest.mark.no_kubernetes - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_kubernetes
  |  
  | tests/smoke_tests/test_basic.py:204
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:204: PytestUnknownMarkWarning: Unknown pytest.mark.no_fluidstack - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_fluidstack  # FluidStack does not support stopping instances in SkyPilot implementation
  |  
  | tests/smoke_tests/test_basic.py:205
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:205: PytestUnknownMarkWarning: Unknown pytest.mark.no_lambda_cloud - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_lambda_cloud  # Lambda Cloud does not support stopping instances
  |  
  | tests/smoke_tests/test_basic.py:206
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:206: PytestUnknownMarkWarning: Unknown pytest.mark.no_kubernetes - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_kubernetes  # Kubernetes does not support stopping instances
  |  
  | tests/smoke_tests/test_basic.py:207
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:207: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast  # This requires port opening
  |  
  | tests/smoke_tests/test_basic.py:229
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:229: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast
  |  
  | tests/smoke_tests/test_basic.py:271
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:271: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast
  |  
  | tests/smoke_tests/test_basic.py:308
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:308: PytestUnknownMarkWarning: Unknown pytest.mark.no_fluidstack - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_fluidstack  # Requires amazon S3
  |  
  | tests/smoke_tests/test_basic.py:309
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:309: PytestUnknownMarkWarning: Unknown pytest.mark.no_scp - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_scp  # SCP does not support num_nodes > 1 yet
  |  
  | tests/smoke_tests/test_basic.py:310
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:310: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast  # Vast does not support num_nodes > 1 yet
  |  
  | tests/smoke_tests/test_basic.py:331
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:331: PytestUnknownMarkWarning: Unknown pytest.mark.no_scp - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_scp  # SCP does not support num_nodes > 1 yet. Run test_scp_logs instead.
  |  
  | tests/smoke_tests/test_basic.py:332
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:332: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast  # Vast does not support num_nodes > 1 yet.
  |  
  | tests/smoke_tests/test_basic.py:417
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:417: PytestUnknownMarkWarning: Unknown pytest.mark.no_kubernetes - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_kubernetes
  |  
  | tests/smoke_tests/test_basic.py:533
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:533: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast  # Vast has low availability for K80 GPUs
  |  
  | tests/smoke_tests/test_basic.py:534
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:534: PytestUnknownMarkWarning: Unknown pytest.mark.no_fluidstack - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_fluidstack  # Fluidstack does not support K80 gpus for now
  |  
  | tests/smoke_tests/test_basic.py:535
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:535: PytestUnknownMarkWarning: Unknown pytest.mark.no_paperspace - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_paperspace  # Paperspace does not support K80 gpus
  |  
  | tests/smoke_tests/test_basic.py:536
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:536: PytestUnknownMarkWarning: Unknown pytest.mark.no_nebius - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_nebius  # Nebius does not support K80s
  |  
  | tests/smoke_tests/test_basic.py:551
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:551: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast  # Vast has low availability for T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:552
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:552: PytestUnknownMarkWarning: Unknown pytest.mark.no_fluidstack - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_fluidstack  # Fluidstack has low availability for T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:553
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:553: PytestUnknownMarkWarning: Unknown pytest.mark.no_paperspace - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_paperspace  # Paperspace does not support T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:554
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:554: PytestUnknownMarkWarning: Unknown pytest.mark.no_nebius - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_nebius  # Nebius does not support T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:569
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:569: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast  # Vast has low availability for T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:570
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:570: PytestUnknownMarkWarning: Unknown pytest.mark.no_fluidstack - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_fluidstack  # Fluidstack has low availability for T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:571
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:571: PytestUnknownMarkWarning: Unknown pytest.mark.no_paperspace - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_paperspace  # Paperspace does not support T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:572
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:572: PytestUnknownMarkWarning: Unknown pytest.mark.no_nebius - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_nebius  # Nebius does not support T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:586
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:586: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast  # Vast has low availability for T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:587
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:587: PytestUnknownMarkWarning: Unknown pytest.mark.no_fluidstack - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_fluidstack  # Fluidstack has low availability for T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:588
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:588: PytestUnknownMarkWarning: Unknown pytest.mark.no_paperspace - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_paperspace  # Paperspace does not support T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:589
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:589: PytestUnknownMarkWarning: Unknown pytest.mark.no_nebius - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_nebius  # Nebius does not support T4 GPUs
  |  
  | tests/smoke_tests/test_basic.py:604
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:604: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast  # Requires other clouds to be enabled
  |  
  | tests/smoke_tests/test_basic.py:605
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:605: PytestUnknownMarkWarning: Unknown pytest.mark.no_fluidstack - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_fluidstack  # Requires other clouds to be enabled
  |  
  | tests/smoke_tests/test_basic.py:621
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:621: PytestUnknownMarkWarning: Unknown pytest.mark.no_fluidstack - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_fluidstack  # Requires other clouds to be enabled
  |  
  | tests/smoke_tests/test_basic.py:622
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:622: PytestUnknownMarkWarning: Unknown pytest.mark.no_vast - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_vast  # Requires other clouds to be enabled
  |  
  | tests/smoke_tests/test_basic.py:623
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:623: PytestUnknownMarkWarning: Unknown pytest.mark.no_paperspace - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_paperspace  # Requires other clouds to be enabled
  |  
  | tests/smoke_tests/test_basic.py:624
  | /home/buildkite/.buildkite-agent/builds/generic_cloud/993bc8ec23b2-1/skypilot-1/smoke-tests/tests/smoke_tests/test_basic.py:624: PytestUnknownMarkWarning: Unknown pytest.mark.no_kubernetes - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
  | @pytest.mark.no_kubernetes
  |  
  | -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html

Tested (run the relevant ones):

• Code formatting: install pre-commit (auto-check on commit) or bash format.sh
• /smoke-test --aws -k test_core_api_sky_launch_fast

[zpoint]

/smoke-test --gcp -k test_gcp_disk_tier

[zpoint]

/smoke-test --aws -k test_core_api_sky_launch_fast

[zpoint]

The gcp failure is not related, see #5380

[zpoint]

The new test do not have thoese warnings

[zpoint]

/smoke-test --aws -k test_core_api_sky_launch_fast

[aylei]

LGTM, thanks for fixing this! @zpoint