[release-20.0] FindErrantGTIDs: superset is not an errant GTID situation (#16725)

[vitess-bot]

Description

This is a backport of #16725

[vitess-bot]

Review Checklist

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General

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.68%. Comparing base (1e3d45c) to head (f412f37).
Report is 1 commits behind head on release-20.0.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-20.0   #16729      +/-   ##
================================================
+ Coverage         68.65%   68.68%   +0.02%     
================================================
  Files              1541     1541              
  Lines            197934   197937       +3     
================================================
+ Hits             135900   135950      +50     
+ Misses            62034    61987      -47     

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