ci: remove kubectl steps from E2E workflow

The CI runner (local-ubuntu-latest) has no kubectl or cluster access.
E2E tests are browser-only via Playwright against a remote Headlamp URL.
The Polaris RBAC fix (deployment/polaris-rbac.yaml) must be applied
directly to the cluster by an operator with kubectl access.

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

.github/workflows/e2e.yaml

@@ -25,14 +25,6 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
-      - name: Configure RBAC for Polaris dashboard proxy access
-        run: kubectl apply -f deployment/polaris-rbac.yaml
-
-      - name: Verify Polaris dashboard is reachable
-        run: |
-          kubectl wait --for=condition=ready pod -l app.kubernetes.io/name=polaris -n polaris --timeout=120s
-          kubectl get svc polaris-dashboard -n polaris
-
       - name: Install Playwright browsers
         run: npx playwright install --with-deps chromium