koord-manager: allow quotas that are not bound to pods to become parent nodes

[xulinfei1996]

Ⅰ. Describe what this PR does

Relax the limit of IsParent change.
If quota is not bound to pods, it can become parent node.
If quota doesn't have children, it can become child node.

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

Patch coverage: 60.97% and project coverage change: +0.01% 🎉

Comparison is base (b791330) 65.04% compared to head (9a48536) 65.05%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1553      +/-   ##
==========================================
+ Coverage   65.04%   65.05%   +0.01%     
==========================================
  Files         352      352              
  Lines       36214    36288      +74     
==========================================
+ Hits        23556    23608      +52     
- Misses      10919    10938      +19     
- Partials     1739     1742       +3     

Flag	Coverage Δ
unittests	65.05% <60.97%> (+0.01%)	⬆️

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

Files Changed	Coverage Δ
pkg/webhook/elasticquota/pod_check.go	71.69% <36.84%> (-19.48%)	⬇️
pkg/webhook/elasticquota/quota_topology.go	67.20% <50.00%> (ø)
pkg/webhook/elasticquota/quota_topology_check.go	75.70% <85.00%> (+2.41%)	⬆️

... and 5 files with indirect coverage changes

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[eahydra]

/lgtm

[buptcozy]

/approve

[eahydra]

/lgtm

[buptcozy]

/approve

[shaloulcy]

/lgtm

[koordinator-bot]

@shaloulcy: changing LGTM is restricted to collaborators

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In response to this:

/lgtm

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[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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