fix flaky test TestQueryTimeoutWithShardTargeting

[harshit-gangal]

Description

This PR fixes the flaky test in TestQueryTimeoutWithShardTargeting on error checking.

Flaky Test fixes are backported to have less CI failures.

Related Issue(s)

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

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.50%. Comparing base (f118ba2) to head (265ae22).
Report is 174 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16150      +/-   ##
==========================================
+ Coverage   68.40%   68.50%   +0.09%     
==========================================
  Files        1556     1544      -12     
  Lines      195121   197729    +2608     
==========================================
+ Hits       133479   135447    +1968     
- Misses      61642    62282     +640     

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