koord-scheduler: ElasticQuota plugin implements EnqueueExtensions

[eahydra]

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

[ZiMengSheng]

/lgtm

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02% ⚠️

Comparison is base (05afefa) 65.82% compared to head (48458f1) 65.80%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1637      +/-   ##
==========================================
- Coverage   65.82%   65.80%   -0.02%     
==========================================
  Files         374      374              
  Lines       39484    39492       +8     
==========================================
  Hits        25989    25989              
- Misses      11609    11616       +7     
- Partials     1886     1887       +1     

Flag	Coverage Δ
unittests	65.80% <100.00%> (-0.02%)	⬇️

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

Files Changed	Coverage Δ
pkg/scheduler/plugins/elasticquota/plugin.go	60.52% <100.00%> (+1.73%)	⬆️

... and 2 files with indirect coverage changes

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[eahydra]

cc @shaloulcy

[jasonliu747]

/lgtm

[koordinator-bot]

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