fix/pri-594-remove-kubectl-apply-rbac-step
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The RBAC step removal accidentally moved Build plugin to root level. Fixes YAML parse error that would prevent E2E workflow from running.
The RBAC manifest must be pre-applied via Flux (infra repo) by a privileged actor before the first workflow run. The Arc Runners service account cannot self-apply RBAC — it has no permissions to retrieve the Role to patch it. Fixes PRI-594.