Change public accounts pages to mount the web UI (#19319)

* Change public accounts pages to mount the web UI

* Fix handling of remote usernames in routes

- When logged in, serve web app
- When logged out, redirect to permalink
- Fix `app-body` class not being set sometimes due to name conflict

* Fix missing `multiColumn` prop

* Fix failing test

* Use `discoverable` attribute to control indexing directives

* Fix `<ColumnLoading />` not using `multiColumn`

* Add `noindex` to accounts in REST API

* Change noindex directive to not be rendered by default before a route is mounted

* Add loading indicator for detailed status in web UI

* Fix missing indicator appearing while account is loading in web UI

app/javascript/mastodon/features/ui/util/async-components.js

@@ -166,6 +166,14 @@ export function FilterModal () {
   return import(/*webpackChunkName: "modals/filter_modal" */'../components/filter_modal');
 }
 
+export function InteractionModal () {
+  return import(/*webpackChunkName: "modals/interaction_modal" */'../../interaction_modal');
+}
+
+export function SubscribedLanguagesModal () {
+  return import(/*webpackChunkName: "modals/subscribed_languages_modal" */'../../subscribed_languages_modal');
+}
+
 export function About () {
   return import(/*webpackChunkName: "features/about" */'../../about');
 }