fix(e2e): migrate E2E namespace from privilegedescalation-dev to headlamp-dev

The E2E workflow and deploy scripts were targeting the legacy
privilegedescalation-dev namespace, which is not managed by Flux GitOps
in privilegedescalation/infra.

The infra repo (PR #11) already provisions the headlamp-dev namespace
and corresponding RBAC (e2e-ci-runner-headlamp-rbac.yaml) that grants
the ARC runner SA (runners-privilegedescalation-gha-rs-no-permission in
arc-runners) the permissions needed to deploy/teardown the E2E
Headlamp instance.

This change aligns all E2E infrastructure to use headlamp-dev:
- .github/workflows/e2e.yaml: E2E_NAMESPACE=headlamp-dev
- scripts/deploy-e2e-headlamp.sh: default namespace and comments
- scripts/teardown-e2e-headlamp.sh: default namespace
- deployment/e2e-ci-runner-rbac.yaml: namespace and add missing events
  permission (already present in infra copy)

Refs: PRI-423
Co-Authored-By: Paperclip <noreply@paperclip.ing>

deployment/e2e-ci-runner-rbac.yaml

@@ -2,26 +2,26 @@
 # RBAC for the GitHub Actions CI runner to manage the E2E Headlamp instance.
 # CI-only test fixture — NOT for production use.
 #
-# Grants the ARC runner service account permissions in the privilegedescalation-dev
+# Grants the ARC runner service account permissions in the headlamp-dev
 # namespace to deploy and tear down a dedicated Headlamp instance via Helm.
-# E2E resources run in `privilegedescalation-dev` — nothing persists beyond a test run.
+# E2E resources run in `headlamp-dev` — nothing persists beyond a test run.
 #
 # Plugin is loaded via ConfigMap volume mount — no custom Docker images.
 #
-# Prerequisites:
-#   kubectl apply -f deployment/e2e-ci-runner-rbac.yaml
+# 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
+  namespace: headlamp-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"]
+    resources: ["services", "serviceaccounts", "configmaps", "secrets", "events"]
     verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
   - apiGroups: [""]
     resources: ["pods"]
@@ -35,7 +35,7 @@ apiVersion: rbac.authorization.k8s.io/v1
 kind: RoleBinding
 metadata:
   name: e2e-ci-runner-binding
-  namespace: privilegedescalation-dev
+  namespace: headlamp-dev
 subjects:
   - kind: ServiceAccount
     name: runners-privilegedescalation-gha-rs-no-permission