Revert "[MM-37013] Async job to fix CRT channel unreads (#18340)" (#19319)

This reverts commit 0da249c651.

store/sqlstore/post_store.go

@@ -2734,23 +2734,3 @@ func (s *SqlPostStore) updateThreadsFromPosts(transaction *sqlxTxWrapper, posts
 	}
 	return nil
 }
-
-// GetUniquePostTypesSince returns the unique post types in a channel after the given timestamp
-func (s *SqlPostStore) GetUniquePostTypesSince(channelId string, timestamp int64) ([]string, error) {
-	query, args, err := s.getQueryBuilder().
-		Select("DISTINCT Type").
-		From("Posts").
-		Where(sq.And{
-			sq.Eq{"ChannelId": channelId},
-			sq.GtOrEq{"CreateAt": timestamp},
-			sq.Eq{"DeleteAt": 0},
-		}).ToSql()
-	if err != nil {
-		return nil, err
-	}
-	types := []string{}
-	if err := s.GetReplicaX().Select(&types, query, args...); err != nil {
-		return nil, err
-	}
-	return types, nil
-}