Deprecated metrics deletion

[GuptaManan100]

Description

This PR deletes the metrics deprecated in the previous release.

Related Issue(s)

• Fixes Cleanup: Deleting the deprecated metrics in VTOrc #16020

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

Review Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.24%. Comparing base (b49494e) to head (36a7701).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16086      +/-   ##
==========================================
+ Coverage   68.23%   68.24%   +0.01%     
==========================================
  Files        1543     1543              
  Lines      197555   197562       +7     
==========================================
+ Hits       134796   134831      +35     
+ Misses      62759    62731      -28     

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