koordlet: fix cgroup driver detection on cgroups-v2, revise UTs

[saintube]

Ⅰ. Describe what this PR does

1. Fix the cgroup driver detection when the koordlet pod runs on cgroups-v2.
2. Revise UTs of the metrics advisor where the TSDB might be failed to create because of the local path.

Ⅱ. Does this pull request fix one issue?

fixes #1346.

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

[codecov]

Codecov Report

Patch coverage: 84.61% and project coverage change: +0.05 🎉

Comparison is base (04a51f4) 64.59% compared to head (9090d00) 64.65%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1353      +/-   ##
==========================================
+ Coverage   64.59%   64.65%   +0.05%     
==========================================
  Files         325      325              
  Lines       33674    33674              
==========================================
+ Hits        21752    21772      +20     
+ Misses      10330    10311      -19     
+ Partials     1592     1591       -1     

Flag	Coverage Δ
unittests	64.65% <84.61%> (+0.05%)	⬆️

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

Impacted Files	Coverage Δ
pkg/koordlet/util/node.go	5.40% <0.00%> (-2.19%)	⬇️
pkg/koordlet/util/system/cgroup_driver.go	50.42% <ø> (ø)
pkg/koordlet/util/pod.go	71.42% <100.00%> (ø)
pkg/koordlet/util/system/cgroup.go	12.09% <100.00%> (+3.69%)	⬆️
pkg/koordlet/util/system/cgroup_driver_linux.go	22.50% <100.00%> (ø)
pkg/koordlet/util/system/config.go	68.75% <100.00%> (ø)
pkg/koordlet/util/system/version.go	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[zwzhang0107]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zwzhang0107

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