fix: Missing mitt.js in vue 3 instance of app (#9596)

app/javascript/packs/v3app.js

@@ -14,6 +14,7 @@ import App from '../v3/App.vue';
 import router, { initalizeRouter } from '../v3/views/index';
 import store from '../v3/store';
 import FluentIcon from 'shared/components/FluentIcon/DashboardIcon';
+import { emitter } from '../shared/helpers/mitt';
 
 Vue.config.env = process.env;
 
@@ -45,11 +46,11 @@ Vue.use(VueRouter);
 Vue.use(VueI18n);
 Vue.use(Vuelidate);
 Vue.use(AnalyticsPlugin);
+Vue.prototype.$emitter = emitter;
 Vue.component('fluent-icon', FluentIcon);
 
 const i18nConfig = new VueI18n({ locale: 'en', messages: i18n });
 
-window.bus = new Vue();
 initializeChatwootEvents();
 initializeAnalyticsEvents();
 initalizeRouter();