koord-scheduler: compatible with lightweight-coscheduling

[eahydra]

Signed-off-by: Joseph joseph.t.lee@outlook.com

Ⅰ. Describe what this PR does

Some users are still using lightweight-coscheduling, so require the coscheduling plugin to be compatible with lightweight-coscheduling. PodGroups are not created when the Pod uses the lightweight-coscheduling API.

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

[eahydra]

cc @tzzcfrank

[codecov]

Codecov Report

Base: 67.52% // Head: 67.51% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (2e9f227) compared to base (718bef7).
Patch coverage: 62.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1007      +/-   ##
==========================================
- Coverage   67.52%   67.51%   -0.02%     
==========================================
  Files         249      249              
  Lines       28174    28177       +3     
==========================================
- Hits        19025    19024       -1     
- Misses       7844     7852       +8     
+ Partials     1305     1301       -4     

Flag	Coverage Δ
unittests	67.51% <62.50%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
.../scheduler/plugins/coscheduling/core/gang_cache.go	74.11% <57.14%> (-0.74%)	⬇️
pkg/scheduler/plugins/coscheduling/core/gang.go	76.97% <100.00%> (-1.27%)	⬇️
pkg/util/httputil/reverseproxy.go	84.84% <0.00%> (+0.53%)	⬆️

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[FillZpp]

/lgtm

[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• apis/OWNERS [FillZpp,hormes]
• pkg/scheduler/OWNERS [hormes]

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