Updates the default E2E_NAMESPACE from privilegedescalation-dev to
headlamp-dev to match the actual namespace used by the reusable E2E workflow.
Also updates comments and RBAC path references to reflect the new
infra repo structure (apps/base/e2e-ci-runner-rbac.yaml).
Fixes PRI-1127
Co-Authored-By: Paperclip <noreply@paperclip.ing>