[kubelet-metrics] remove plugin

[atoulme]

Description:
Remove kubelet-metrics plugin.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.13%. Comparing base (eb4d7ee) to head (5e3a127).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7081      +/-   ##
==========================================
+ Coverage   37.88%   38.13%   +0.24%     
==========================================
  Files         366      363       -3     
  Lines       25620    25450     -170     
==========================================
- Hits         9706     9705       -1     
+ Misses      15105    14937     -168     
+ Partials      809      808       -1     

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