Revert "Introduce a configurable remote metadata client AND migrate LockService to the client (#831)" to avoid jarHell in downstream plugins.

[cliu123]

Description

[Describe what this change achieves]

Related Issues

Resolves opensearch-project/ml-commons#4202

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[codecov]

Codecov Report

❌ Patch coverage is 65.15152% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.53%. Comparing base (fd51d8f) to head (a5f7f31).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...opensearch/jobscheduler/utils/LockServiceImpl.java	63.49%	17 Missing and 6 partials ⚠️

❌ Your project status has failed because the head coverage (70.53%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #836      +/-   ##
==========================================
+ Coverage   70.49%   70.53%   +0.04%     
==========================================
  Files          42       42              
  Lines        2057     2057              
  Branches      165      165              
==========================================
+ Hits         1450     1451       +1     
  Misses        495      495              
+ Partials      112      111       -1     

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