test: unskip schedule_now after kibana public route

Leftover from #593 / #615. `security_entity_analytics_api_schedule_risk_engine_now.yml` stays in `skippedFilesStack` because the CLI calls `POST /api/risk_score/engine/schedule_now` and 9.5.3 only registers `/internal/risk_score/engine/schedule_now`.

Unblock:
- elastic/kibana#289375 merges (registers the public path)
- CLI CI pin moves to a Kibana that includes that change, or a 9.5 backport

Then drop the skip in `codegen/functional/kb.ts` and regenerate. Cleanup and configure already run after #615.

Related: elastic/schemas-js#90, elastic/elastic-client-generator-js#284 (configure PUT is already in the CLI via `@elastic/schemas` 0.7.3).