Description of problem:

ROSA hypershift cluster service configures a custom identity provider in the hosted cluster CR to create a non-default kubeadmin user.

      spec:
        autoscaling: {}
        clusterID: __CLUSTER_UUID__
        configuration:
          oauth:
            identityProviders:
            - htpasswd:
                fileData:
                  name: htpasswd-secret
 

When this is configured, the kubeadmin-password secret is not generated for the hosted cluster in the cluster's namespace. 

The problem is that the hypershift addon agent assumes that the kubeadmin-password secret is always generated for a hosted cluster and tries to copy it over to the hub cluster when the HC's API server becomes available. Although this does not break the agent's reconcile functionality, it generates many error messages in the logs and requeues the reconcile causing unnecessary CPU consumption.

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