Add sorting by username, creation and last activity in moderation view (#13076)

* Add ability to order accounts in moderation view

* Display last status date in “Most recent activity” for remote users

app/views/admin/accounts/index.html.haml

@@ -19,6 +19,12 @@
     %ul
       %li= filter_link_to t('admin.accounts.moderation.all'), staff: nil
       %li= filter_link_to t('admin.accounts.roles.staff'), staff: '1'
+  .filter-subset
+    %strong= t 'generic.order_by'
+    %ul
+      %li= filter_link_to t('relationships.most_recent'), order: nil
+      %li= filter_link_to t('admin.accounts.username'), order: 'alphabetic'
+      %li= filter_link_to t('relationships.last_active'), order: 'active'
 
 = form_tag admin_accounts_url, method: 'GET', class: 'simple_form' do
   .fields-group