fix(e2e): make workflow self-sufficient with RBAC apply steps (PRI-324)

- Apply e2e-ci-runner RBAC + polaris RBAC in workflow before pre-flight check
- Add e2e-ci-runner-polaris Role+RoleBinding so CI runner can manage polaris namespace RBAC
- Add roles/rolebindings CRUD to e2e-ci-runner Role (headlamp-dev namespace)
- Collapsed MISSING_ROLE/MISSING_ROLEBINDING into single MISSING flag (QA nit)
- Drop non-standard --quiet flag on kubectl auth can-i (QA nit)

Address PRI-324 QA feedback: workflow now applies its own RBAC so the pre-flight
check is meaningful and the green path is achievable.

deployment/e2e-ci-runner-rbac.yaml

@@ -30,6 +30,34 @@ rules:
   - apiGroups: [""]
     resources: ["serviceaccounts/token"]
     verbs: ["create"]
+  # Apply Polaris dashboard RBAC in the polaris namespace
+  - apiGroups: ["rbac.authorization.k8s.io"]
+    resources: ["roles", "rolebindings"]
+    verbs: ["get", "list", "create", "update", "patch", "delete"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: e2e-ci-runner-polaris
+  namespace: polaris
+rules:
+  - apiGroups: ["rbac.authorization.k8s.io"]
+    resources: ["roles", "rolebindings"]
+    verbs: ["get", "list", "create", "update", "patch", "delete"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: e2e-ci-runner-polaris
+  namespace: polaris
+subjects:
+  - kind: ServiceAccount
+    name: runners-privilegedescalation-gha-rs-no-permission
+    namespace: arc-runners
+roleRef:
+  kind: Role
+  name: e2e-ci-runner-polaris
+  apiGroup: rbac.authorization.k8s.io
 ---
 apiVersion: rbac.authorization.k8s.io/v1
 kind: RoleBinding