Add CRD-level label selector validation to CapacityQuota

[norbertcyran]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Added CRD-level validation for CapacityQuota selector. Adding validation on CRD required mirroring the LabelSelector struct from apimachinery. Otherwise, CEL rules would have too high cost and CRD would not apply.

Which issue(s) this PR fixes:

Part of #8703

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Added CRD validation to CapacityQuota selector

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[norbertcyran]

/assign x13n

[k8s-ci-robot]

This issue is currently awaiting triage.

If SIG Autoscaling contributors determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: norbertcyran
Once this PR has been reviewed and has the lgtm label, please ask for approval from x13n. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• cluster-autoscaler/OWNERS

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

[k8s-ci-robot]

PR needs rebase.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.