Replace the kubernetes.io/ingress.class annotation with the ingressClassName field

Use the ingressClassName field instead of the kubernetes.io/ingress.class annotation in Ingress resources.

https://kubernetes.io/docs/concepts/services-networking/ingress/#deprecated-annotation

@apodkowa: This merge request is awaiting triage, we'll update it soon.

added triageneeds-attention label

removed triageneeds-attention label

assigned to @rbritoda

added A-gitops p4 labels

mentioned in commit 06c0a496

merged