Add cpu suppress test and revise memory qos

[saintube]

Ⅰ. Describe what this PR does

1. add UTs for feature CPUSuppress
2. add CRD validations for Memory QoS strategy

Ⅱ. Does this pull request fix one issue?

partially helps #69

Ⅲ. Describe how to verify it

run UTs and see the rise of code coverage

Ⅳ. Special notes for reviews

None

[codecov-commenter]

Codecov Report

Merging #112 (d68738b) into main (dd30303) will increase coverage by 3.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   49.82%   52.91%   +3.08%     
==========================================
  Files          77       77              
  Lines        7248     7250       +2     
==========================================
+ Hits         3611     3836     +225     
+ Misses       3309     3066     -243     
- Partials      328      348      +20     

Flag	Coverage Δ
unittests	52.91% <100.00%> (+3.08%)	⬆️

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

Impacted Files	Coverage Δ
pkg/util/system/cgroup_resource.go	0.00% <ø> (ø)
pkg/koordlet/resmanager/cpu_suppress.go	75.00% <100.00%> (+75.00%)	⬆️
pkg/koordlet/resmanager/resmanager.go	5.50% <0.00%> (+2.75%)	⬆️
pkg/koordlet/resmanager/metrics_query.go	56.84% <0.00%> (+3.15%)	⬆️

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[jasonliu747]

/lgtm

[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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