ci: standalone PR awareness workflow (decouple from pr-test reusable chain) (#25387)

.github/workflows/pr-test-extra.yml

@@ -59,7 +59,7 @@ permissions:
   actions: write
   contents: read
   issues: read
-  pull-requests: write
+  pull-requests: read
 
 jobs:
   # =============================================== check changes ====================================================
@@ -85,17 +85,6 @@ jobs:
       pr_test_yml: '.github/workflows/pr-test-extra.yml'
     secrets: inherit
 
-  # always(): on a PR without `run-ci-extra` the rest of this workflow's graph
-  # is skipped, but we still want the awareness block updated so the author
-  # sees this run was a no-op.
-  call-pr-awareness:
-    needs: check-changes
-    if: always() && github.event_name == 'pull_request'
-    uses: ./.github/workflows/_pr-awareness-comment.yml
-    with:
-      workflow_kind: pr-test-extra
-    secrets: inherit
-
   # =============================================== sgl-kernel ====================================================
   sgl-kernel-build-wheels:
     needs: check-changes