Stop calling Webpacker in full-stack tests (#30763)

.github/workflows/test-ruby.yml

@@ -285,9 +285,13 @@ jobs:
 
       - uses: actions/download-artifact@v4
         with:
-          path: './public'
+          path: './'
           name: ${{ github.sha }}
 
+      - name: Expand archived asset artifacts
+        run: |
+          tar xvzf artifacts.tar.gz
+
       - name: Set up Ruby environment
         uses: ./.github/actions/setup-ruby
         with:
@@ -405,7 +409,7 @@ jobs:
 
       - uses: actions/download-artifact@v4
         with:
-          path: './public'
+          path: './'
           name: ${{ github.sha }}
 
       - name: Set up Ruby environment