Description of problem:

When the code change of 8509 is involved, there's no ManagedClusterAddOn on the hub for the local-clsuter(selfmanagement is disabled), so create the addonDeploymentConfig, and add it into the ManagedClusterAddOn to specify the endpoint operator and metrics collector is not working now. 

Need Dev to confirm it's working as designed now,  or take it as the issue.

Version-Release number of selected component (if applicable): FC0

How reproducible:

Steps to Reproduce:

1.  Enabled the observbaility in the ACM with selfmanagement is disabled
2. create AddOnDeploymentConfig to specify one node name
   ```
   apiVersion: addon.open-cluster-management.io/v1alpha1
   kind: AddOnDeploymentConfig
   metadata:
     name: observability
     namespace: open-cluster-management-observability
   spec:
     nodePlacement:
       nodeSelector:
         kubernetes.io/hostname: ip-10-0-49-135.us-east-2.compute.internal
   ```
3. add the  AddOnDeploymentConfig into the ManagedClusterAddOn
   ```
   apiVersion: addon.open-cluster-management.io/v1alpha1
   kind: ManagedClusterAddOn
   metadata:
     name: observability-controller
     namespace: open-cluster-management-observability
   spec:
     configs:
     - group: addon.open-cluster-management.io
       resource: addondeploymentconfigs
       name: observability
       namespace: open-cluster-management-observability
   ```
4. the endpoint operator and metrics collector are not running on the specified node.
5. add the AddOnDeploymentConfig into the ClusterManagementAddOn is also not working, endpoint operator and metrics collector are not running on the specified node as well
   ```
   apiVersion: addon.open-cluster-management.io/v1alpha1
   kind: ClusterManagementAddOn
   metadata:
     name: observability-controller
   spec:
     addOnMeta:
       displayName: observability-controller
       description: observability-controller
     supportedConfigs:
     - group: addon.open-cluster-management.io
       resource: addondeploymentconfigs
       defaultConfig:
         name: observability
         namespace: open-cluster-management-observability
   ```

Actual results:

Expected results:

Additional info: