Add validating webhook for IngressClass

[johngmyers]

Issue

None

Description

Adds a validating admission webhook for IngressClass. If the controller is LBC, validates that any
parameters are of the right apiGroup and kind and exist.

Does not yet add the new webhook to the Helm chart.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: johngmyers
Once this PR has been reviewed and has the lgtm label, please assign m00nf1sh for approval. For more information see the Kubernetes Code Review Process.

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[codecov-commenter]

Codecov Report

Patch coverage: 71.87% and project coverage change: +0.06% 🎉

Comparison is base (9b27d26) 54.78% compared to head (3015d14) 54.84%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3310      +/-   ##
==========================================
+ Coverage   54.78%   54.84%   +0.06%     
==========================================
  Files         148      149       +1     
  Lines        8616     8648      +32     
==========================================
+ Hits         4720     4743      +23     
- Misses       3564     3573       +9     
  Partials      332      332              

Files Changed	Coverage Δ
webhooks/networking/ingressclass_validator.go	71.87% <71.87%> (ø)

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/lifecycle stale

[k8s-triage-robot]

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/lifecycle rotten

[k8s-triage-robot]

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This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/close

[k8s-ci-robot]

@k8s-triage-robot: Closed this PR.

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the PR is closed

You can:

• Reopen this PR with /reopen
• Mark this PR as fresh with /remove-lifecycle rotten
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/close

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