Bug 2219846

Describe the issue:
With ACM 2.8 + ODF 4.12, The user is not able to apply DRPolicy to the subscription workload and the UI apply policy modal shows empty.

Describe the task you were trying to accomplish:
- ACM 2.8 console has deprecated the PlacementRule type and moved to the Placement type for Subscription applications. 
- When a user creates a Subscription application using ACM 2.8 console, it will be created with Placement only.
- But 4.12 DR UI and Ramen operator both are not supporting Placement for Subscription applications.
- So, DR UI is unable to detect the applications and display for assigning a policy.

Workarround:
- ACM 2.8 console, Still able to detect the PlacementRule which is created from CLI.
- The pre-requisite to creating the Subscription application in ACM 2.8 with PlacementRule is:
   1. Create a new project (i.e., namespace)
   2. Create a PlacementRule using application-namespace which is created from the previous step:
---------------------------------------------------------------------------
apiVersion: apps.open-cluster-management.io/v1
kind: PlacementRule
metadata:
  name: {placement-rule-name}
  namespace: {application-namespace}
spec:
  clusterSelector:
    matchLabels:
      {managed-cluster-matching-labels}
--------------------------------------------------------------------------------
   3. While creating the application using the ACM console on the Subscription application page, Choose this PlacementRule

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Additional information:
Backend BZ for the same: https://bugzilla.redhat.com/show_bug.cgi?id=2216190