Migrate Groups to not use the Layered store (#10946)

model/cluster_message.go

@@ -24,7 +24,6 @@ const (
 	CLUSTER_EVENT_CLEAR_SESSION_CACHE_FOR_USER                      = "clear_session_user"
 	CLUSTER_EVENT_INVALIDATE_CACHE_FOR_ROLES                        = "inv_roles"
 	CLUSTER_EVENT_INVALIDATE_CACHE_FOR_SCHEMES                      = "inv_schemes"
-	CLUSTER_EVENT_INVALIDATE_CACHE_FOR_GROUPS                       = "inv_groups"
 
 	CLUSTER_SEND_BEST_EFFORT = "best_effort"
 	CLUSTER_SEND_RELIABLE    = "reliable"