Deletion of a managedclusters label is not working when using the ClusterInstance to remove the label from the extralabels list. 

That is, updating the ClusterInstance in git by removing the label from the extralabel list and committing and syncing the git repo to the hub no longer deletes the label from the managedcluster CRs.

This workflow worked when the SiteConfig CR was updated to delete a label from the labels list in the siteconfig CR.  The deprecation of this behavior is impacting our customer Verizon who had built an operational workflow around the previous behavior.  

Note: also verified that using "oc edit clusterinstance" to delete the label does not remove the label from the managedcluster CR.