Refactor all controllers to use Patch() instead of Update()
when adding or removing finalizers to improve performance, and to avoid
removing non-cached fields erroneously.

This is necesary because we no longer cache the last-applied-configuration
annotation, so when we add/remove the finalizers, we are removing that field
from the metadata. This causes issues with clients when they don't see that
annotation (e.g. apply the same ClusterExtension twice).

Update ClusterCatalog and ClusterExtension controllers to use Patch-based
funalizer management (ClusterExtensionRevision already uses Patch())

Signed-off-by: Todd Short <tshort@redhat.com>