feat(ray): Remove initContainers

[MortalHappiness]

Tracking issue

Resolves: #5165

Why are the changes needed?

The init container in flyte is no longer needed because the latest kuberay already has init container.

What changes were proposed in this pull request?

Remove the init container in flyte.

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

[MortalHappiness]

@ByronHsu Can you help me review this PR? Thanks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.05%. Comparing base (f1c2231) to head (f6b6ecb).
Report is 18 commits behind head on master.

❗ Current head f6b6ecb differs from pull request most recent head ea174bf. Consider uploading reports for the commit ea174bf to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5178      +/-   ##
==========================================
- Coverage   59.06%   59.05%   -0.02%     
==========================================
  Files         646      646              
  Lines       55714    55701      -13     
==========================================
- Hits        32910    32894      -16     
- Misses      20208    20210       +2     
- Partials     2596     2597       +1     

Flag	Coverage Δ
unittests	59.05% <ø> (-0.02%)	⬇️

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[ByronHsu]

Looks good. Have you run e2e test? Can you attach a successful run screenshot?

[MortalHappiness]

Looks good. Have you run e2e test? Can you attach a successful run screenshot?