feat(qrm): refine healthz

[zzzzhhb]

What type of PR is this?

Features

What this PR does / why we need it:

refine healthz interface, aggregate all exception info to healthz api.

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 61.87291% with 114 lines in your changes are missing coverage. Please review.

Project coverage is 55.13%. Comparing base (751d44b) to head (1240043).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...-plugins/cpu/dynamicpolicy/policy_async_handler.go	45.23%	19 Missing and 4 partials ⚠️
...g/agent/qrm-plugins/memory/dynamicpolicy/policy.go	44.11%	15 Missing and 4 partials ⚠️
...ugins/memory/dynamicpolicy/policy_async_handler.go	72.72%	17 Missing and 1 partial ⚠️
pkg/util/general/healthz.go	83.52%	11 Missing and 3 partials ⚠️
pkg/agent/qrm-plugins/cpu/dynamicpolicy/policy.go	25.00%	10 Missing and 2 partials ⚠️
cmd/base/healthz.go	0.00%	10 Missing ⚠️
cmd/base/context.go	20.00%	8 Missing ⚠️
...m-plugins/memory/handlers/sockmem/sockmem_linux.go	46.15%	7 Missing ⚠️
cmd/base/options/generic.go	66.66%	1 Missing ⚠️
...lugins/cpu/dynamicpolicy/policy_advisor_handler.go	0.00%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #482      +/-   ##
==========================================
+ Coverage   54.91%   55.13%   +0.21%     
==========================================
  Files         513      513              
  Lines       56747    56953     +206     
==========================================
+ Hits        31163    31401     +238     
+ Misses      22255    22199      -56     
- Partials     3329     3353      +24     

Flag	Coverage Δ
unittest	55.13% <61.87%> (+0.21%)	⬆️

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