koord-scheduler: eliminate unnecessary memory overhead and lock conflicts

[eahydra]

Ⅰ. Describe what this PR does

Conduct a performance test on the scheduler and find some unnecessary memory overhead and lock conflicts.

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

[jasonliu747]

/lgtm

[codecov]

Codecov Report

Patch coverage: 57.89% and project coverage change: +0.02 🎉

Comparison is base (f833fd9) 64.50% compared to head (dd35802) 64.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1390      +/-   ##
==========================================
+ Coverage   64.50%   64.53%   +0.02%     
==========================================
  Files         330      330              
  Lines       33905    33925      +20     
==========================================
+ Hits        21872    21894      +22     
+ Misses      10427    10424       -3     
- Partials     1606     1607       +1     

Flag	Coverage Δ
unittests	64.53% <57.89%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
pkg/scheduler/frameworkext/framework_extender.go	63.85% <25.00%> (-0.46%)	⬇️
pkg/scheduler/plugins/reservation/transformer.go	65.71% <33.33%> (-0.32%)	⬇️
pkg/util/node.go	69.87% <62.50%> (-1.55%)	⬇️
pkg/scheduler/plugins/reservation/cache.go	83.22% <80.00%> (-0.78%)	⬇️
pkg/scheduler/plugins/deviceshare/utils.go	98.88% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[saintube]

/lgtm

[ZiMengSheng]

/lgtm

[FillZpp]

/lgtm

[eahydra]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: eahydra, FillZpp, jasonliu747

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• apis/OWNERS [FillZpp]
• pkg/scheduler/OWNERS [eahydra]
• pkg/util/OWNERS [FillZpp]

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