ci(gha): fix notifications on cancelled workflows (#13654)

.github/workflows/test-runner.yml

@@ -142,12 +142,24 @@ jobs:
       - windows-bazel
       - windows-cmake
     # Run even if the other jobs failed or were skipped.
-    if: ${{ contains(fromJSON('["schedule", "push", "workflow_dispatch"]'), github.event_name) }}
+    if: always()
     runs-on: ubuntu-latest
     steps:
       - name: Notify Google Chat
         shell: bash
         run: |
+          event_name="${{ github.event_name }}"
+          case "${event_name}" in
+            schedule)
+              ;;
+            push)
+              ;;
+            workflow_dispatch)
+              ;;
+            *)
+              exit 0
+              ;;
+          esac
           failure="${{ contains(needs.*.result, 'failure') }}"
           cancelled="${{ contains(needs.*.result, 'cancelled') }}"
           status=""