Migrate registry-operator to kubebuilder v3

[kim-tsao]

Which area/kind this issue is related to?

/area registry

Issue Description

The registry operator was originally built using the v2 plugin which causes problems when trying to scaffold new CRs because the artifacts wind up with a deprecated v1beta1 version. Manually updating these versions to v1 may result in unstable code especially since we will be introducing validating webhooks and a cert manager for our new CRs. To avoid any problems, we should fully migrate the operator and make it compatible with the latest controller tools/runtime.
https://book.kubebuilder.io/migration/v2vsv3.html