koordlet: cleanup runtimehooks and remove the unused code.

[xigang]

Ⅰ. Describe what this PR does

koordlet: cleanup runtimehooks code and remove the unused code

Ⅱ. Does this pull request fix one issue?

NONE

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

Patch coverage has no change and project coverage change: +0.01 🎉

Comparison is base (0c38b28) 65.73% compared to head (ef1e0ca) 65.74%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1208      +/-   ##
==========================================
+ Coverage   65.73%   65.74%   +0.01%     
==========================================
  Files         290      290              
  Lines       30647    30646       -1     
==========================================
+ Hits        20145    20148       +3     
+ Misses       9023     9020       -3     
+ Partials     1479     1478       -1     

Flag	Coverage Δ
unittests	65.74% <0.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/koordlet/runtimehooks/runtimehooks.go	74.07% <0.00%> (+0.90%)	⬆️

... and 1 file with indirect coverage changes

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[hormes]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes, jasonliu747

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• pkg/koordlet/OWNERS [hormes,jasonliu747]

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