FEATURE: Highlight expired bookmark reminders (#15317)

The user can select what happens with a bookamrk after it expires. New
option allow bookmark's reminder to be kept even after it has expired.
After a bookmark's reminder notification is created, the reminder date
will be highlighted in red until the user resets the reminder date.
User can do that using the new Clear Reminder button from the dropdown.

app/serializers/current_user_serializer.rb

@@ -68,6 +68,7 @@ class CurrentUserSerializer < BasicUserSerializer
              :can_review,
              :draft_count,
              :default_calendar,
+             :bookmark_auto_delete_preference,
              :pending_posts_count
 
   delegate :user_stat, to: :object, private: true
@@ -142,6 +143,10 @@ class CurrentUserSerializer < BasicUserSerializer
     object.user_option.default_calendar
   end
 
+  def bookmark_auto_delete_preference
+    object.user_option.bookmark_auto_delete_preference
+  end
+
   def can_send_private_email_messages
     scope.can_send_private_messages_to_email?
   end