[release-19.0] Revert unwanted logging change to vttestserver (#15148)

[vitess-bot]

Description

This is a backport of #15148

[vitess-bot]

Review Checklist

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General

• Ensure that the Pull Request has a descriptive title.
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Backward compatibility

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (release-19.0@020a082). Click here to learn what that means.

Additional details and impacted files

@@               Coverage Diff               @@
##             release-19.0   #15150   +/-   ##
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  Coverage                ?   70.64%           
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  Files                   ?     1376           
  Lines                   ?   182412           
  Branches                ?        0           
===============================================
  Hits                    ?   128866           
  Misses                  ?    53546           
  Partials                ?        0           

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