Add concurrency group to prevent duplicate sticky comments

Agent-Logs-Url: https://github.com/github/explore/sessions/1439af4e-c097-4fc9-8a1f-22c96f6de461

Co-authored-by: kenyonj <4008677+kenyonj@users.noreply.github.com>

Author: Copilot

.github/workflows/explore-triage-commenter.yml

@@ -16,6 +16,10 @@ on:
       - 'topics/**'
       - 'collections/**'
 
+concurrency:
+  group: explore-triage-commenter-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+
 permissions:
   contents: read
   pull-requests: write