descheduler: check nodemetrics cr is expired or not when descheduling

[lucming]

Ⅰ. Describe what this PR does

case:
The nodemetric cr has not been updated for a long time, e.g. the koordlet was deleted, but the load information written last time is particularly high, causing pods on this node being evicted all the time, even though the actual load was low.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

check nodemetrics cr is expired or not when descheduling

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

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (cae8705) 65.94% compared to head (cb9b83f) 65.97%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1721      +/-   ##
==========================================
+ Coverage   65.94%   65.97%   +0.02%     
==========================================
  Files         386      386              
  Lines       41922    41934      +12     
==========================================
+ Hits        27647    27664      +17     
+ Misses      12228    12224       -4     
+ Partials     2047     2046       -1     

Flag	Coverage Δ
unittests	65.97% <40.00%> (+0.02%)	⬆️

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

Files	Coverage Δ
pkg/descheduler/apis/config/v1alpha2/defaults.go	14.05% <100.00%> (+1.41%)	⬆️
...duler/framework/plugins/loadaware/low_node_load.go	74.72% <100.00%> (ø)
...ler/apis/config/validation/validation_loadaware.go	0.00% <0.00%> (ø)
...er/framework/plugins/loadaware/utilization_util.go	87.50% <25.00%> (-1.51%)	⬇️

... and 2 files with indirect coverage changes

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[eahydra]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eahydra

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• pkg/descheduler/OWNERS [eahydra]

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