feat(agent): refactor eviction/reporter healthz rule

[zzzzhhb]

What type of PR is this?

enhancements

What this PR does / why we need it:

refactor healthz rules for eviction manager and reporter manager

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 73.68421% with 5 lines in your changes missing coverage. Please review.

Project coverage is 56.31%. Comparing base (11f15e8) to head (58675bb).

Files	Patch %	Lines
pkg/agent/evictionmanager/manager.go	0.00%	2 Missing ⚠️
...ent/evictionmanager/plugin/memory/numa_pressure.go	90.00%	1 Missing ⚠️
...t/evictionmanager/plugin/memory/system_pressure.go	50.00%	1 Missing ⚠️
...agent/evictionmanager/plugin/resource/resources.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #614      +/-   ##
==========================================
+ Coverage   56.21%   56.31%   +0.10%     
==========================================
  Files         543      543              
  Lines       50302    50314      +12     
==========================================
+ Hits        28275    28336      +61     
+ Misses      18436    18383      -53     
- Partials     3591     3595       +4     

Flag	Coverage Δ
unittest	56.31% <73.68%> (+0.10%)	⬆️

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