ci: remove helm/kubectl Polaris deploy steps from E2E workflow

Polaris is already installed on the CI cluster. The E2E workflow
was failing because the runner SA lacks RBAC to deploy to the
polaris namespace. Remove Setup Helm, Setup kubectl, Deploy Polaris,
Apply RBAC, and Wait for readiness steps.

Resolves: PRI-28, PRI-109

.github/workflows/e2e.yaml

@@ -65,30 +65,6 @@ jobs:
             echo "::warning::Version mismatch — repo has $EXPECTED but Headlamp runs $DEPLOYED_VERSION. Tests may fail due to stale plugin."
           fi
 
-      - name: Setup Helm
-        uses: azure/setup-helm@v4
-
-      - name: Setup kubectl
-        uses: azure/setup-kubectl@v4
-
-      - name: Deploy Polaris to CI cluster
-        run: |
-          helm repo add fairwinds-stable https://charts.fairwinds.com/stable
-          helm repo update
-          helm upgrade --install polaris fairwinds-stable/polaris \
-            --namespace polaris --create-namespace \
-            --set dashboard.enabled=true \
-            --set webhook.enabled=false \
-            --wait --timeout 5m
-
-      - name: Apply RBAC
-        run: kubectl apply -f deployment/polaris-rbac.yaml
-
-      - name: Wait for Polaris dashboard readiness
-        run: |
-          kubectl rollout status deployment/polaris-dashboard -n polaris --timeout=120s
-          kubectl wait --for=condition=ready pod -l app.kubernetes.io/name=polaris,app.kubernetes.io/component=dashboard -n polaris --timeout=120s
-
       - name: Install Playwright browsers
         run: npx playwright install --with-deps chromium