Description of problem:

When a PlacementBinding exists in a Policy namespace (even if it isn't associated with a given Policy), all root Policies are unable to update their status and are endlessly re-reconciled until the PlacementBinding is fixed.

Version-Release number of selected component (if applicable): 2.9.0

How reproducible: Consistently

Steps to Reproduce:

1. Create a PlacementBinding with a placementRef having an apiGroup of "cluster.open-cluster-management.io" and a kind of "PlacementRule". (The subjects can be any Policy, even one that's nonexistent.)
2. Create a Policy with a new PlacementBinding and observe the root status does not get updated.

Actual results: Root policy not updated

Expected results: Root policy is updated