Revert "improve possible performance bottleneck (go-gitea#28547)" (go…

…-gitea#28593)

This reverts commit b35d3fd.

This is totally wrong. I think `Update join` hasn't been supported well
by xorm.

I just revert the PR and will try to send another one.

models/issues/comment.go

@@ -1161,9 +1161,14 @@ func DeleteComment(ctx context.Context, comment *Comment) error {
 // UpdateCommentsMigrationsByType updates comments' migrations information via given git service type and original id and poster id
 func UpdateCommentsMigrationsByType(ctx context.Context, tp structs.GitServiceType, originalAuthorID string, posterID int64) error {
 	_, err := db.GetEngine(ctx).Table("comment").
-		Join("INNER", "issue", "issue.id = comment.issue_id").
-		Join("INNER", "repository", "issue.repo_id = repository.id").
-		Where("repository.original_service_type = ?", tp).
+		Where(builder.In("issue_id",
+			builder.Select("issue.id").
+				From("issue").
+				InnerJoin("repository", "issue.repo_id = repository.id").
+				Where(builder.Eq{
+					"repository.original_service_type": tp,
+				}),
+		)).
 		And("comment.original_author_id = ?", originalAuthorID).
 		Update(map[string]any{
 			"poster_id":          posterID,