utils: change metrics server util pkg name

[zwzhang0107]

Ⅰ. Describe what this PR does

pkg name metrics is conflict in pkg/util/metricsserver and pkg/util/metrics

change to metricsserver

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.79%. Comparing base (f85aefc) to head (b6cb0df).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2016      +/-   ##
==========================================
+ Coverage   68.77%   68.79%   +0.01%     
==========================================
  Files         422      422              
  Lines       39058    39058              
==========================================
+ Hits        26864    26869       +5     
+ Misses       9870     9861       -9     
- Partials     2324     2328       +4     

Flag	Coverage Δ
unittests	68.79% <ø> (+0.01%)	⬆️

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[hormes]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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