Automatic merge from submit-queue (batch tested with PRs 45346, 45903, 45958, 46042, 45975)

ResourceQuota admission control injects registry

**What this PR does / why we need it**:
The `ResourceQuota` admission controller works with a registry that maps a GroupKind to an Evaluator.  The registry used in the existing plug-in is not injectable, which makes usage of the ResourceQuota plug-in in other API server contexts difficult.  This PR updates the code to support late injection of the registry via a plug-in initializer.