Revert "[Backport 2.x] add query group stats constructs"

[reta]

Reverts #15473

[reta]

The pull request (#15473) was merged while breaking API compatibility checks and as such - blocks all further pull requests from being merged.

[github-actions]

❌ Gradle check result for 7ddcf80: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

✅ Gradle check result for 9cd2635: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.08%. Comparing base (c63ad5a) to head (9cd2635).
Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #15483      +/-   ##
============================================
+ Coverage     71.72%   72.08%   +0.36%     
- Complexity    63609    63939     +330     
============================================
  Files          5216     5214       -2     
  Lines        297554   297446     -108     
  Branches      43311    43299      -12     
============================================
+ Hits         213417   214419    +1002     
+ Misses        66330    65452     -878     
+ Partials      17807    17575     -232     

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[kaushalmahi12]

@reta I don't think we need to revert these changes. I had commented on this issue let me know if I am missing anything here

[jainankitk]

Closing this PR in favor of actual fix: #15486