Ray Plugin - Use serviceAccount from Config if set

[peterghaddad]

Tracking issue

Closes #5821

Why are the changes needed?

These changes are necessary because the SA is pulled from the k8s context regardless of what's set in the config.

What changes were proposed in this pull request?

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.95%. Comparing base (1279740) to head (1490254).
Report is 32 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5928      +/-   ##
==========================================
+ Coverage   36.53%   36.95%   +0.41%     
==========================================
  Files        1249     1310      +61     
  Lines      128230   131401    +3171     
==========================================
+ Hits        46847    48555    +1708     
- Misses      77346    78632    +1286     
- Partials     4037     4214     +177     

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (?)
unittests-flyteadmin	54.07% <ø> (-0.07%)	⬇️
unittests-flytecopilot	22.23% <ø> (+10.50%)	⬆️
unittests-flytectl	62.39% <ø> (-0.02%)	⬇️
unittests-flyteidl	6.95% <ø> (+0.03%)	⬆️
unittests-flyteplugins	53.84% <100.00%> (+0.20%)	⬆️
unittests-flytepropeller	43.08% <ø> (+0.07%)	⬆️
unittests-flytestdlib	55.30% <ø> (-0.12%)	⬇️

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[peterghaddad]

@eapolinario let me know your thoughts!