Prepare vue3 branch

[ShGKme]

☑️ Resolves

• A part of Vue 3 Migration #9448
• Prepares Vue 3 branch with packages and green npm run dev

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

🚧 Tasks

• Remove unneeded in Vue 3 deps and migrate their usages (vue-frag, portal, compiler)
• Remove dependencies that are not ready for Vue 3 yet (@nextcloud/dialogs, @nextcloud/uploads, nextcloud-vue-collections)
• Comment out usages of uninstalled dependencies
• Temporarily replace @nextcloud/dialogs toasts with OCP.Toast
• Upgrade dependencies to Vue 3 (vue-frag, portal, compiler)
• Migrate Vuex
• Migrate VueRouter
• Migrate Vue apps initialization
• Remove this.$set / Vue.set and delete
• Fix migration issue with :key and v-for on <template>

🏁 Checklist

IT DOESN'T WORK 😀

• 🌏 Tested with Chrome, Firefox and Safari or should not be risky to browser differences
• 🖥️ Tested with Desktop client or should not be risky for it
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required