add test for leak of file lock

[silentred]

This PR should pass tests after #21766 is merged.

[k8s-ci-robot]

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[serathius]

Thanks, this really helps!

[k8s-ci-robot]

@silentred: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-unit-test-arm64	1d4e138	link	true	/test pull-etcd-unit-test-arm64
pull-etcd-unit-test-386	1d4e138	link	true	/test pull-etcd-unit-test-386
pull-etcd-unit-test-amd64	1d4e138	link	true	/test pull-etcd-unit-test-amd64
pull-etcd-coverage-report	1d4e138	link	true	/test pull-etcd-coverage-report

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.21%. Comparing base (e7ca1c0) to head (1d4e138).
⚠️ Report is 24 commits behind head on main.

Additional details and impacted files

see 24 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21779      +/-   ##
==========================================
+ Coverage   70.15%   70.21%   +0.06%     
==========================================
  Files         426      426              
  Lines       35242    35242              
==========================================
+ Hits        24723    24745      +22     
+ Misses       9125     9108      -17     
+ Partials     1394     1389       -5     

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