void removeResourceIdealState(String clusterName, String resourceName) throws Exception {
    resourcesToIdealStates.remove(resourceName);
    resourceToResourceInfoMap.remove(resourceName);
    triggerIdealStateChangeNotification();
  }
Remove ideal state for the given resource name. The {@code clusterName} is not used. It will trigger ideal state
change notification.
@param clusterName The name of the helix cluster, not used.
@param resourceName The name of the resource.
@throws Exception
ambry-clustermap/src/test/java/com/github/ambry/clustermap/MockHelixAdmin.java