update the concurrency group so destroy workflows can cancel deploy workflows (github#25621)

Author: mikesurowiec

.github/workflows/azure-preview-env-deploy.yml

@@ -34,7 +34,7 @@ permissions:
 
 # This allows one deploy workflow to interrupt another
 concurrency:
-  group: '${{ github.workflow }} @ ${{ github.event.pull_request.head.label }}'
+  group: 'preview-env @ ${{ github.head_ref || github.run_id }}'
   cancel-in-progress: true
 
 jobs:

.github/workflows/azure-preview-env-destroy.yml

@@ -19,6 +19,11 @@ on:
 permissions:
   contents: read
 
+# This allows one deploy workflow to interrupt another
+concurrency:
+  group: 'preview-env @ ${{ github.head_ref || github.run_id }}'
+  cancel-in-progress: true
+
 jobs:
   destory-azure-preview-env:
     name: Destroy