scheduler: assure Fairness and DeadlockFree

[ZiMengSheng]

Ⅰ. Describe what this PR does

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

[codecov]

Codecov Report

Attention: Patch coverage is 61.17647% with 33 lines in your changes are missing coverage. Please review.

Project coverage is 68.66%. Comparing base (ae23cc9) to head (f4156cb).
Report is 3 commits behind head on main.

Files	Patch %	Lines
pkg/scheduler/plugins/coscheduling/core/core.go	7.69%	24 Missing ⚠️
pkg/scheduler/plugins/coscheduling/core/gang.go	80.00%	4 Missing ⚠️
.../scheduler/plugins/coscheduling/core/gang_cache.go	81.81%	4 Missing ⚠️
...cheduler/plugins/coscheduling/core/gang_summary.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1996      +/-   ##
==========================================
- Coverage   68.67%   68.66%   -0.01%     
==========================================
  Files         421      421              
  Lines       38779    38829      +50     
==========================================
+ Hits        26632    26663      +31     
- Misses       9835     9852      +17     
- Partials     2312     2314       +2     

Flag	Coverage Δ
unittests	68.66% <61.17%> (-0.01%)	⬇️

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[buptcozy]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: buptcozy

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• pkg/scheduler/OWNERS [buptcozy]

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