Add account migration UI (#11846)

Fix #10736

- Change data export to be available for non-functional accounts
- Change non-functional accounts to include redirecting accounts

app/views/settings/profiles/show.html.haml

@@ -60,6 +60,11 @@
 %h6= t('auth.migrate_account')
 %p.muted-hint= t('auth.migrate_account_html', path: settings_migration_path)
 
+%hr.spacer/
+
+%h6= t 'migrations.incoming_migrations'
+%p.muted-hint= t('migrations.incoming_migrations_html', path: settings_aliases_path)
+
 - if open_deletion?
   %hr.spacer/