Run gopls modernize on codebase (#34751)

Recent modernize fixes:
https://github.com/golang/tools/commits/master/gopls/internal/analysis/modernize

models/issues/comment.go

@@ -9,6 +9,7 @@ import (
 	"context"
 	"fmt"
 	"html/template"
+	"slices"
 	"strconv"
 	"unicode/utf8"
 
@@ -196,12 +197,7 @@ func (t CommentType) HasMailReplySupport() bool {
 }
 
 func (t CommentType) CountedAsConversation() bool {
-	for _, ct := range ConversationCountedCommentType() {
-		if t == ct {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(ConversationCountedCommentType(), t)
 }
 
 // ConversationCountedCommentType returns the comment types that are counted as a conversation
@@ -614,7 +610,7 @@ func UpdateCommentAttachments(ctx context.Context, c *Comment, uuids []string) e
 		if err != nil {
 			return fmt.Errorf("getAttachmentsByUUIDs [uuids: %v]: %w", uuids, err)
 		}
-		for i := 0; i < len(attachments); i++ {
+		for i := range attachments {
 			attachments[i].IssueID = c.IssueID
 			attachments[i].CommentID = c.ID
 			if err := repo_model.UpdateAttachment(ctx, attachments[i]); err != nil {