🐞 Fix REST sync pipeline to clean up stale category data files (#60800)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: heiskr

content/rest/agent-tasks/agent-tasks.md

@@ -51,7 +51,6 @@ children:
   - /guides
   - /actions
   - /activity
-  - /agent-tasks
   - /announcement-banners
   - /apps
   - /billing

content/rest/agent-tasks/index.md

@@ -48,3 +48,8 @@
 - /github-ae@latest/admin/overview/about-data-residency
 - /github-ae@latest/admin/overview/deploying-github-ae
 - /github-ae@latest/admin/overview/initializing-github-ae
+
+# Agent tasks REST API was rolled back before launch
+/rest
+- /rest/agent-tasks
+- /rest/agent-tasks/agent-tasks