vtgate: increment vtgate_warnings counter for non atomic commits

[maxenglander]

Description

This change was supposed to get merged with #14848 but it looks like I never pushed it up 😮‍💨

Related Issue(s)

#14848
#14815

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

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
• Ensure there is a link to an issue (except for internal cleanup and flaky test fixes), new features should have an RFC that documents use cases and test cases.

Tests

• Bug fixes should have at least one unit or end-to-end test, enhancement and new features should have a sufficient number of tests.

Documentation

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• There should be some code comments as to why things are implemented the way they are.
• There should be a comment at the top of each new or modified test to explain what the test does.

New flags

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Backward compatibility

• Protobuf changes should be wire-compatible.
• Changes to _vt tables and RPCs need to be backward compatible.
• RPC changes should be compatible with vitess-operator
• If a flag is removed, then it should also be removed from vitess-operator and arewefastyet, if used there.
• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1bf8dda) 47.36% compared to head (4f8636a) 47.37%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15010   +/-   ##
=======================================
  Coverage   47.36%   47.37%           
=======================================
  Files        1144     1144           
  Lines      238995   238996    +1     
=======================================
+ Hits       113197   113215   +18     
+ Misses     117213   117196   -17     
  Partials     8585     8585           

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