Description: Disabling GRC globally (in the MultiClusterHub object) is cleaning up the governance-policy-addon-controller before it has completed cleaning up the addons that it's managing. Without the addon-controller, no controller is managing the GRC ManagedClusterAddons and the GRC components are not cleaned up on the managed clusters as a result.

Coordination with Install and possibly Server Foundation (for the addon-framework) is likely required for this.

Initial Slack thread with installer: https://redhat-internal.slack.com/archives/CUEMEHRA9/p1686250237726939

Solution: 

1.  The Hub installer deletes the ClusterManagementAddon and waits for all the ManagedClusterAddOn objects to be deleted, indicating successful uninstalls. Then it can remove the GRC Hub deployments.