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/views/statuses/_detailed_status.html.haml

@@ -56,7 +56,7 @@
       - else
         = link_to status.application.name, status.application.website, class: 'detailed-status__application', target: '_blank', rel: 'noopener noreferrer'
       ·
-    = link_to remote_interaction_path(status, type: :reply), class: 'modal-button detailed-status__link' do
+    %span.detailed-status__link
       - if status.in_reply_to_id.nil?
         = fa_icon('reply')
       - else
@@ -65,12 +65,12 @@
       = " "
     ·
     - if status.public_visibility? || status.unlisted_visibility?
-      = link_to remote_interaction_path(status, type: :reblog), class: 'modal-button detailed-status__link' do
+      %span.detailed-status__link
         = fa_icon('retweet')
         %span.detailed-status__reblogs>= friendly_number_to_human status.reblogs_count
         = " "
       ·
-    = link_to remote_interaction_path(status, type: :favourite), class: 'modal-button detailed-status__link' do
+    %span.detailed-status__link
       = fa_icon('star')
       %span.detailed-status__favorites>= friendly_number_to_human status.favourites_count
       = " "