[release-20.0] Fix Incorrect Optimization with LIMIT and GROUP BY (#16263)

[vitess-bot]

Description

This is a backport of #16263

[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.60%. Comparing base (15a66d5) to head (6a3f0cd).
Report is 3 commits behind head on release-20.0.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-20.0   #16268   +/-   ##
=============================================
  Coverage         68.60%   68.60%           
=============================================
  Files              1541     1541           
  Lines            197812   197814    +2     
=============================================
+ Hits             135702   135718   +16     
+ Misses            62110    62096   -14     

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[frouioui]

We should merge #16267 first for the upgrade/downgrade test.

[frouioui]

I forced push the same commit again on this PR, for some reason the CI workflows were blocked in canceled

Dismissing as the end-to-end test seems to be wrong.