Sample on root span level

[sentrivana]

• for spans that have a local parent (i.e., non-root spans/transactions), just inherit the sampling decision from the parent
• update some tests

Closes #3766

[codecov]

❌ 1594 Tests Failed:

Tests completed	Failed	Passed	Skipped
19899	1594	18305	4412

View the top 1 failed tests by shortest run time

tests.test_utils test_datetime_from_isoformat[2021-01-01T00:00:00.000000-00:00-expected_output4]

Stack Traces | 0.001s run time

tests/test_utils.py:109: in test_datetime_from_isoformat
    assert datetime_from_isoformat(input_str) == expected_output, input_str
E   NameError: name 'datetime_from_isoformat' is not defined

View the full list of 2 ❄️ flaky tests

tests.test_utils test_datetime_from_isoformat[2021-01-01T00:00:00.000000-0000-expected_output6]

Flake rate in main: 43.86% (Passed 32 times, Failed 25 times)

Stack Traces | 0.001s run time

tests/test_utils.py:109: in test_datetime_from_isoformat
    assert datetime_from_isoformat(input_str) == expected_output, input_str
E   NameError: name 'datetime_from_isoformat' is not defined

tests.test_scope test_with_isolation_scope_data

Flake rate in main: 99.09% (Passed 2 times, Failed 218 times)

Stack Traces | 0.001s run time

tests/test_scope.py:387: in test_with_isolation_scope_data
    assert scope._tags == {"before_isolation_scope": 1}
E   AssertionError: assert {} == {'before_isolation_scope': 1}
E     
E     Right contains 1 more item:
E     {'before_isolation_scope': 1}
E     
E     Full diff:
E     + {}
E     - {
E     -     'before_isolation_scope': 1,
E     - }

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[sentrivana]

@sl0thentr0py Removed parent_sampled and updated the tests a bit more, please recheck

[sl0thentr0py]

this test should mirror the one above where you added the continue_trace