docs: def get_validated_augment_query(self, augment_query=None):
          """
          Common rules for reading list augmentation hierarchy.
  
          1. Sponsored Content.
          2. Video Content.
          """
          augment_query = self.validate_query(augment_query)
  
          # Given an invalid query, reach for a Sponsored query.
          if not augment_query:
              augment_query = self.validate_query(Content.search_objects.sponsored())
  
          # Given an invalid Sponsored query, reach for a Video query.
          if not augment_query:
              reading_list_config = getattr(settings, "READING_LIST_CONFIG", {})
              excluded_channel_ids = reading_list_config.get("excluded_channel_ids", [])
              augment_query = self.validate_query(Content.search_objects.evergreen_video(
                  excluded_channel_ids=excluded_channel_ids
              ))
  
          return augment_query