Fix 500 when deleting a dismissed review (#27903) (#27910)

Backport #27903 by @lng2020

Fix #27767 
Add a test to ensure its behavior

Co-authored-by: Nanguan Lin <70063547+lng2020@users.noreply.github.com>

models/issues/review.go

@@ -898,6 +898,16 @@ func DeleteReview(ctx context.Context, r *Review) error {
 		return err
 	}
 
+	opts = FindCommentsOptions{
+		Type:     CommentTypeDismissReview,
+		IssueID:  r.IssueID,
+		ReviewID: r.ID,
+	}
+
+	if _, err := sess.Where(opts.ToConds()).Delete(new(Comment)); err != nil {
+		return err
+	}
+
 	if _, err := sess.ID(r.ID).Delete(new(Review)); err != nil {
 		return err
 	}