DEV: Remove all code referencing at_desktop bookmark reminders (#9650)

We have found no need for these reminder types, so we are removing the code for them.

lib/auth/default_current_user_provider.rb

@@ -124,10 +124,6 @@ class Auth::DefaultCurrentUserProvider
         u.update_last_seen!
         u.update_ip_address!(ip)
       end
-
-      BookmarkReminderNotificationHandler.defer_at_desktop_reminder(
-        user: u, request_user_agent: @request.user_agent
-      )
     end
 
     @env[CURRENT_USER_KEY] = current_user