Reference shared infra RBAC in deployment scripts

PRI-750: update plugin repos to reference shared infra RBAC (PRI-695 follow-up)

- deployment/e2e-ci-runner-rbac.yaml: replaced duplicate manifest with
  reference comment pointing to privilegedescalation/infra/base/rbac/e2e-ci-runner-headlamp-rbac.yaml
- scripts/deploy-e2e-headlamp.sh: updated RBAC preflight comment and error
  message to reference infra path
- scripts/teardown-e2e-headlamp.sh: added RBAC reference comment

Infra RBAC is the source of truth managed by Flux GitOps. CI workflow
unchanged (Hugh owns .github/workflows/).

deployment/e2e-ci-runner-rbac.yaml

@@ -1,46 +1,12 @@
 ---
-# RBAC for the GitHub Actions CI runner to manage the E2E Headlamp instance.
+# RBAC for the GitHub Actions CI runner to manage E2E Headlamp instances.
 # CI-only test fixture — NOT for production use.
 #
-# Grants the ARC runner service account permissions in the privilegedescalation-dev
-# namespace to deploy and tear down a dedicated Headlamp instance via Helm.
+# This file is a REFERENCE ONLY. The canonical manifest lives in:
+#   privilegedescalation/infra/base/rbac/e2e-ci-runner-headlamp-rbac.yaml
+#
+# The infra repo is managed by Flux GitOps and is the source of truth.
+# Do not apply this file directly — it is kept here for developer reference only.
+#
 # E2E resources run in `privilegedescalation-dev` — nothing persists beyond a test run.
-#
-# Plugin is loaded via ConfigMap volume mount — no custom Docker images.
-#
-# Note: This RBAC is mirrored in privilegedescalation/infra (base/rbac/)
-# and managed by Flux GitOps. The infra repo is the source of truth.
-apiVersion: rbac.authorization.k8s.io/v1
-kind: Role
-metadata:
-  name: e2e-ci-runner
-  namespace: privilegedescalation-dev
-rules:
-  # Helm needs to manage these resources for the Headlamp chart
-  - apiGroups: ["apps"]
-    resources: ["deployments"]
-    verbs: ["get", "list", "create", "update", "patch", "delete", "watch"]
-  - apiGroups: [""]
-    resources: ["services", "serviceaccounts", "configmaps", "secrets", "events"]
-    verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
-  - apiGroups: [""]
-    resources: ["pods"]
-    verbs: ["get", "list", "watch"]
-  # Token creation for E2E test auth
-  - apiGroups: [""]
-    resources: ["serviceaccounts/token"]
-    verbs: ["create"]
----
-apiVersion: rbac.authorization.k8s.io/v1
-kind: RoleBinding
-metadata:
-  name: e2e-ci-runner-binding
-  namespace: privilegedescalation-dev
-subjects:
-  - kind: ServiceAccount
-    name: runners-privilegedescalation-gha-rs-no-permission
-    namespace: arc-runners
-roleRef:
-  kind: Role
-  name: e2e-ci-runner
-  apiGroup: rbac.authorization.k8s.io
+# RBAC is managed via Flux from privilegedescalation/infra — do not apply manually.