ETL manager should print job ID.

[RobinL]

When other users are using ETL manager they don't always have access to full AWS logs. When they get an error it can be ard to track down logs if etl_manager has cleaned up the job. You can get it as the Id field from job.job_status when the job run stars like:
https://github.com/moj-analytical-services/data_linking/blob/ba490bcf7725d894b6430d42098032ae5b0eb984/jobrunner.py#L145