Don't add build reports to PRs.

.openpublishing.publish.config.json

@@ -26,6 +26,7 @@
   "git_repository_branch_open_to_public_contributors": "main",
   "skip_source_output_uploading": false,
   "need_preview_pull_request": true,
+  "need_pr_comments": false,  
   "contribution_branch_mappings": {},
   "dependent_repositories": [
     {