feat: migrate AppStateController to inherit from BaseController V2

app/scripts/background.js

@@ -1024,8 +1024,8 @@ export function setupController(
     METAMASK_CONTROLLER_EVENTS.UPDATE_BADGE,
     updateBadge,
   );
-  controller.appStateController.on(
-    METAMASK_CONTROLLER_EVENTS.UPDATE_BADGE,
+  controller.controllerMessenger.subscribe(
+    METAMASK_CONTROLLER_EVENTS.APP_STATE_UNLOCK_CHANGE,
     updateBadge,
   );