Load reviewer for comments when dismissing a review (#24281)

If a comment dismisses a review, we need to load the reviewer to show
whose review has been dismissed.

Related to:

20b6ae0e53/templates/repo/issue/view_content/comments.tmpl (L765-L770)

We don't need `.Review.Reviewer` for all comments, because
"dismissing" doesn't happen often, or we would have already received
error reports.

models/issues/comment_list.go

@@ -56,7 +56,7 @@ func (comments CommentList) getLabelIDs() []int64 {
 	return ids.Values()
 }
 
-func (comments CommentList) loadLabels(ctx context.Context) error { //nolint
+func (comments CommentList) loadLabels(ctx context.Context) error {
 	if len(comments) == 0 {
 		return nil
 	}
@@ -415,7 +415,7 @@ func (comments CommentList) getReviewIDs() []int64 {
 	return ids.Values()
 }
 
-func (comments CommentList) loadReviews(ctx context.Context) error { //nolint
+func (comments CommentList) loadReviews(ctx context.Context) error {
 	if len(comments) == 0 {
 		return nil
 	}
@@ -453,6 +453,14 @@ func (comments CommentList) loadReviews(ctx context.Context) error { //nolint
 
 	for _, comment := range comments {
 		comment.Review = reviews[comment.ReviewID]
+
+		// If the comment dismisses a review, we need to load the reviewer to show whose review has been dismissed.
+		// Otherwise, the reviewer is the poster of the comment, so we don't need to load it.
+		if comment.Type == CommentTypeDismissReview {
+			if err := comment.Review.LoadReviewer(ctx); err != nil {
+				return err
+			}
+		}
 	}
 	return nil
 }