chore: remove unnecessary lock value copy in test

[shota3506]

This PR remove unnecessary lock value copy in test. It makes the native go vet ./... command pass.

The comment in the code is outdated - the deadlock is tested without accessing the lock from the test code.

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Title of the PR
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.
• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.78%. Comparing base (95b191d) to head (278a47a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #24939      +/-   ##
==========================================
- Coverage   60.79%   60.78%   -0.02%     
==========================================
  Files         351      351              
  Lines       60439    60439              
==========================================
- Hits        36745    36737       -8     
- Misses      20772    20782      +10     
+ Partials     2922     2920       -2     

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