Avoid run change title process when the title is same (#27467) (#27557)

Backport #27467 manually.

services/issue/issue.go

@@ -53,6 +53,10 @@ func ChangeTitle(ctx context.Context, issue *issues_model.Issue, doer *user_mode
 	oldTitle := issue.Title
 	issue.Title = title
 
+	if oldTitle == title {
+		return nil
+	}
+
 	if err = issues_model.ChangeIssueTitle(ctx, issue, doer, oldTitle); err != nil {
 		return
 	}