Description of the problem: On deleting the remote cluster’s service account secret present in openshift-config namespace, the Clusters page in the MTC UI does not get updated on its own and on updating it, it gets stuck.

Severity: Medium

Version-Release number of selected component (if applicable):
MTC 1.7.0 


Steps to reproduce:
1. Login to the MTC console and add the remote cluster to the MTC UI.
2. Login to the controller cluster and remove the source cluster’s service account secret from openshift-config namespace.
3. Check the migcluster yaml from backend. It will show 2 critical warnings
- category: Critical
    lastTransitionTime: "2022-03-10T14:03:24Z"
    message: 'The `serviceAccountSecretRef` must reference a valid `secret`, subject:
      openshift-config/source-cluster-wj6rl.'
    reason: NotFound
    status: "True"
    type: InvalidSaSecretRef
  - category: Critical
    lastTransitionTime: "2022-03-10T14:03:24Z"
    message: 'Reconcile failed: [Service Account Secret not found for source-cluster].
      See controller logs for details.'
    status: "True"
    type: ReconcileFailed



4. Check the Clusters page on the MTC console.


Actual Result: 
The status of the remote cluster stays Connected. Also, if we update it by clicking on Edit option for that cluster, it shows the connection failure but the UI gets stuck on closing the wizard.

Expected Result: 
The status of the remote cluster should be updated in the UI as disconnected.