Revert "Remove the checkout logic to avoid injection (#24442)" (#24452)

This reverts commit 1e239c8.

Author: vidai-msft

.github/workflows/pr-labeled.yml

@@ -14,6 +14,10 @@ jobs:
       pull-requests: write
       contents: read
     steps:
+    - uses: actions/checkout@v3
+      with:
+        sparse-checkout: |
+          .github
     - name: process label
       shell: pwsh
       run: .github/workflows/script/PrLabeled.ps1 -LabelName "${{ github.event.label.name }}" -PrUrl $env:PR