Implement conditional checkout for closed PRs

Add cleanup checkout step for closed pull requests

Signed-off-by: Rajesh Nagarajan <139469505+Rajesh-Nagarajan-11@users.noreply.github.com>

Author: Rajesh-Nagarajan-11

.github/workflows/deploy-preview.yml

@@ -41,12 +41,20 @@ jobs:
         run: sudo snap install dart-sass
 
       - name: Checkout
+        if: github.event.action != 'closed'
         uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           submodules: recursive
           fetch-depth: 0
 
+      - name: Checkout for cleanup
+        if: github.event.action == 'closed'
+        uses: actions/checkout@v6
+        with:
+          ref: gh-pages
+          fetch-depth: 0
+
       - name: Install Node.js dependencies
         if: github.event.action != 'closed'
         run: "[[ -f package-lock.json || -f npm-shrinkwrap.json ]] && npm ci || true"