ci: fix workflow_dispatch concurrency collisions (head_ref || run_id)

head_ref is empty on workflow_dispatch, so every manual dispatch of these
four workflows shared one empty-suffix group and cancelled each other.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.github/workflows/windows-setup-e2e.yml

@@ -26,7 +26,7 @@ on:
   workflow_dispatch:
 
 concurrency:
-  group: windows-setup-e2e-${{ github.head_ref }}
+  group: windows-setup-e2e-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true
 
 jobs: