PLT-7978 Add websocket event for user role update (#7745)

* Add websocket event for user role update

* Fix tests

* More test fixes

model/websocket_message.go

@@ -24,6 +24,7 @@ const (
 	WEBSOCKET_EVENT_UPDATE_TEAM         = "update_team"
 	WEBSOCKET_EVENT_USER_ADDED          = "user_added"
 	WEBSOCKET_EVENT_USER_UPDATED        = "user_updated"
+	WEBSOCKET_EVENT_USER_ROLE_UPDATED   = "user_role_updated"
 	WEBSOCKET_EVENT_MEMBERROLE_UPDATED  = "memberrole_updated"
 	WEBSOCKET_EVENT_USER_REMOVED        = "user_removed"
 	WEBSOCKET_EVENT_PREFERENCE_CHANGED  = "preference_changed"