Add new logs for debugging

This is the orchestrator portion of the effort to improve logging.

• stick to one way of logging: logger.log( 'level', { message: 'shalalalala' } )
• stick with requestId key instead of 'x-request-id' so we can parse for one type of key in logger data
• because I see evaluator logs with msg && message && normalized_message but not Orchestrator, reformat the message param to be an object with message key and see what happens in Logstash Prod 😰
• add when we start and end orchestration

Make sure smaller update lands smoothly first.

Bug: T364413