[release-20.0] test: TestQueryTimeoutWithShardTargeting fix flaky test (#18242)

[vitess-bot]

Description

This is a backport of #18242

[vitess-bot]

Review Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Report is 2 commits behind head on release-20.0.

Additional details and impacted files

@@               Coverage Diff               @@
##             release-20.0   #18248   +/-   ##
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  Coverage                ?   66.42%           
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  Files                   ?     1543           
  Lines                   ?   244889           
  Branches                ?        0           
===============================================
  Hits                    ?   162674           
  Misses                  ?    82215           
  Partials                ?        0           

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