Controller: controller-runtime v0.23 has removed webhook.CustomValidator with adminssions.Validator

[kittomic]

How to categorize this issue?

/area open-source dev-productivity
/kind enhancement

What would you like to be added:

We should upgrade to the latest versions of our go upstream dependencies:

• sigs.k8s.io/controller-runtime to v0.23.0
• k8s.io/* to v0.35.0
• Refactor api/autoscaling/v1alpha1 to use admissions.Validator

Why is this needed:

controller-runtime v0.23 has removed webhook.CustomValidator in favor of admissions.Validator.

Downstream consumers to the types defined in api/autoscaling/v1alpha1 are blocked from supporting controller-runtime >= v0.23 due to this breaking change.

[kittomic]

See kubernetes-sigs/controller-runtime#3360

A breaking change has been introduced in controller-runtime that requires supporting the generic admissions.Validator and removing webhook.CustomValidator.

Downstream consumers of the api types defined in pvc-autoscaler will be prevented from upgrading the controller-runtime >= v0.23 due to this breaking change.

The use-case of downstream consumers of the api types will mostly be other controllers/operators who are referencing the types defined in api/autoscaling/v1alpha1.