[release-20.0] bugfix: INSERT IGNORE not inserting rows (#18151)

[vitess-bot]

Description

This is a backport of #18151

[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.40%. Comparing base (5dcf247) to head (91e8c1b).
Report is 14 commits behind head on release-20.0.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-20.0   #18163      +/-   ##
================================================
+ Coverage         66.38%   66.40%   +0.02%     
================================================
  Files              1543     1543              
  Lines            244886   244895       +9     
================================================
+ Hits             162575   162630      +55     
+ Misses            82311    82265      -46     

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[github-actions]

This PR is being marked as stale because it has been open for 30 days with no activity. To rectify, you may do any of the following:

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If no action is taken within 7 days, this PR will be closed.

[github-actions]

This PR is being marked as stale because it has been open for 30 days with no activity. To rectify, you may do any of the following:

• Push additional commits to the associated branch.
• Remove the stale label.
• Add a comment indicating why it is not stale.

If no action is taken within 7 days, this PR will be closed.

[github-actions]

This PR is being marked as stale because it has been open for 30 days with no activity. To rectify, you may do any of the following:

• Push additional commits to the associated branch.
• Remove the stale label.
• Add a comment indicating why it is not stale.

If no action is taken within 7 days, this PR will be closed.

[harshit-gangal]

v20 EOL