[CRD-v1] Unbundle the OPA plugin #12168
Description
As decided in the proposal https://github.com/strimzi/proposals/blob/main/097-deprecate-OPA-authorization.md, we should stop bundling the OPA plugin in our images when the dedicated OPA API is dropped together with the v1beta2 API. This means it should not be present anymore in Strimzi 1.0.0/0.52.0.