chore: improve error logs in server/cluster/cluser.go

[SuminSSon]

fixes part of #20710

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 Toolchain Guide
• 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.
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• My build is green (troubleshooting builds).
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[andrii-korotkov-verkada]

Typo in the PR name imporve -> improve

[ishitasequeira]

Changes look good to me!! Rebased the PR to rerun the unit tests. Will wait for CI to pass for approving and merging the change.

[ishitasequeira]

@SuminSSon can you take a look at the failing tests?

[SuminSSon]

@ishitasequeira Thank you! I’ll check the failing tests and make any necessary adjustments. I’ll work on getting the CI to pass.

[codecov]

Codecov Report

Attention: Patch coverage is 26.47059% with 25 lines in your changes missing coverage. Please review.

Project coverage is 55.12%. Comparing base (993d79c) to head (27dbfed).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
server/cluster/cluster.go	26.47%	25 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20711      +/-   ##
==========================================
- Coverage   55.21%   55.12%   -0.09%     
==========================================
  Files         324      324              
  Lines       55256    55256              
==========================================
- Hits        30508    30459      -49     
- Misses      22133    22174      +41     
- Partials     2615     2623       +8     

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[SuminSSon]

@ishitasequeira I’ve fixed the failing tests, and everything is passing now. Please let me know if there’s anything else I should address. Thank you!