webhook: revise elasticquota mutating when validating disabled

[saintube]

Ⅰ. Describe what this PR does

In the current version of the koord-manager, the event handler of the elastic quota reconciling the quota topology cache is only instantiated by the elastic quota validating handler. It means the handler cannot work well when we enable the quota mutating but disable quota validating since the topology cache is invalid.
To fix this issue, we also try instantiating the event handler of the elastic quota in the quota mutating handler when it has not been instantiated.

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 10.52632% with 34 lines in your changes missing coverage. Please review.

Project coverage is 67.86%. Comparing base (290ae09) to head (81c38fb).
Report is 1 commits behind head on main.

Files	Patch %	Lines
...k/elasticquota/plugin_check_quota_meta_validate.go	0.00%	18 Missing ⚠️
.../webhook/elasticquota/mutating/mutating_handler.go	0.00%	9 Missing ⚠️
pkg/webhook/elasticquota/mutating/webhooks.go	0.00%	5 Missing ⚠️
...hook/elasticquota/validating/validating_handler.go	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2135      +/-   ##
==========================================
- Coverage   67.91%   67.86%   -0.05%     
==========================================
  Files         441      441              
  Lines       41547    41569      +22     
==========================================
- Hits        28215    28212       -3     
- Misses      10902    10927      +25     
  Partials     2430     2430              

Flag	Coverage Δ
unittests	67.86% <10.52%> (-0.05%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ZiMengSheng]

/lgtm

[shaloulcy]

/lgtm

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes

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:

• pkg/webhook/OWNERS [hormes]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment