koordlet: fix the cpu.shares conversion on cgroups-v2

[saintube]

Ⅰ. Describe what this PR does

koordlet: fix the value conversion between cpu.shares and cpu.weights (cgroups-v2), use the same conversion as the kubelet.

link: https://github.com/kubernetes/enhancements/tree/master/keps/sig-node/2254-cgroup-v2#phase-1-convert-from-cgroups-v1-settings-to-v2

Ⅱ. Does this pull request fix one issue?

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

[hormes]

/lgtm
/approve

[jasonliu747]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• pkg/koordlet/OWNERS [hormes,jasonliu747]

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[codecov]

Codecov Report

Patch coverage: 75.00% and project coverage change: +0.02% 🎉

Comparison is base (53efaaf) 64.62% compared to head (976c51d) 64.65%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1521      +/-   ##
==========================================
+ Coverage   64.62%   64.65%   +0.02%     
==========================================
  Files         346      346              
  Lines       35123    35129       +6     
==========================================
+ Hits        22699    22712      +13     
+ Misses      10756    10754       -2     
+ Partials     1668     1663       -5     

Flag	Coverage Δ
unittests	64.65% <75.00%> (+0.02%)	⬆️

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

Files Changed	Coverage Δ
pkg/koordlet/util/system/cgroup_resource.go	83.50% <ø> (ø)
pkg/koordlet/util/system/cgroup2.go	84.08% <75.00%> (-0.44%)	⬇️

... and 2 files with indirect coverage changes

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