fix(e2e): apply RBAC before deploy step

The deploy script preflight check (deploy-e2e-headlamp.sh:37-41) verifies
RBAC permissions before proceeding, but the workflow never applied the RBAC
manifest. Add the missing Apply RBAC step after Setup Helm and before Deploy.

Fixes https://github.com/privilegedescalation/headlamp-polaris-plugin/issues/79

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/e2e.yaml

@@ -35,6 +35,9 @@ jobs:
       - name: Setup Helm
         uses: azure/setup-helm@v4
 
+      - name: Apply RBAC
+        run: kubectl apply -f deployment/e2e-ci-runner-rbac.yaml
+
       - name: Install dependencies
         run: npm ci