feat(RHOAIENG-25241): disable ray usage metrics by default

[kryanbeane]

Issue link

What changes have been made

Made RAY_USAGE_STATS_ENABLED default to = 0, which == disabled. Added unit tests to ensure enabledment and disablement. Also did manual testing and verified that a deployed custom build image has a default env var of RAY_USAGE_STATS_ENABLED = 0 on both head and worker pods

I verified that the env was present on the cluster

I also deployed a custom codeflare-sdk build on cluster and verified that /tmp/ray/session_xxx/usage_stats.json file does not exist. This is where ray temp writes usage stats to on the head.

Verification steps

• Build custom image of codeflare-sdk (which goes to .dist folder)
• Drag that to jupyter notebook in your cluster or locally, use it to install codeflare in notebook
• Create a cluster (don't specify envs) and ensure head and workers have the env in place with a value of 0

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • Testing is not required for this change

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.47%. Comparing base (028d0d5) to head (51f594a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #828      +/-   ##
==========================================
+ Coverage   92.45%   92.47%   +0.01%     
==========================================
  Files          24       24              
  Lines        1419     1421       +2     
==========================================
+ Hits         1312     1314       +2     
  Misses        107      107              

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