mem.eviction: adding some enhancements

[lubinszARM]

What type of PR is this?

Enhancements

What this PR does / why we need it:

Many oncall channels need these enhancements

Which issue(s) this PR fixes:

Some optimizations for numa.mem.eviction & system.mem.eviction

Special notes for your reviewer:

None

[codecov]

Codecov Report

Attention: Patch coverage is 69.76744% with 26 lines in your changes missing coverage. Please review.

Project coverage is 61.69%. Comparing base (0b0409b) to head (3d9a63f).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...t/evictionmanager/plugin/memory/system_pressure.go	60.00%	7 Missing and 3 partials ⚠️
...ent/evictionmanager/plugin/memory/numa_pressure.go	71.42%	7 Missing and 1 partial ⚠️
pkg/agent/evictionmanager/plugin/memory/helper.go	71.42%	3 Missing and 3 partials ⚠️
...amic/adminqos/eviction/memory_pressure_eviction.go	50.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #885   +/-   ##
=======================================
  Coverage   61.68%   61.69%           
=======================================
  Files         637      637           
  Lines       67640    67690   +50     
=======================================
+ Hits        41727    41761   +34     
- Misses      21779    21803   +24     
+ Partials     4134     4126    -8     

Flag	Coverage Δ
unittest	61.69% <69.76%> (+<0.01%)	⬆️

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