[release-19.0] Fix ZooKeeper Topology connection locks not being cleaned up correctly (#15757)

[vitess-bot]

Description

This is a backport of #15757

[vitess-bot]

Hello @frouioui, there are conflicts in this backport.

Please address them in order to merge this Pull Request. You can execute the snippet below to reset your branch and resolve the conflict manually.

Make sure you replace origin by the name of the vitessio/vitess remote

git fetch --all
gh pr checkout 15764 -R vitessio/vitess
git reset --hard origin/release-19.0
git cherry-pick -m 1 14b36d030ebe605894ff29eba6c7a1ba7d716fba

[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.
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Backward compatibility

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• vtctl command output order should be stable and awk-able.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 67.45%. Comparing base (e167ca8) to head (37ea83d).

Files	Patch %	Lines
go/vt/topo/zk2topo/lock.go	75.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-19.0   #15764      +/-   ##
================================================
- Coverage         67.45%   67.45%   -0.01%     
================================================
  Files              1560     1560              
  Lines            192760   192762       +2     
================================================
- Hits             130029   130026       -3     
- Misses            62731    62736       +5     

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