Improve logging on RunPipelineScheduleWorker

Panos Kanellidisrequested to merge
improve_worker_logging into master

What does this MR do and why?

As part of the effort to resolve https://gitlab.com/gitlab-com/request-for-help/-/issues/3176 (Internal), this MR adds:

  1. Logs for all the validation steps of the worker
  2. Logs in case the Subsequent service returns a ServiceResponse.error, at the moment we only capture exceptions, not expected errors
  3. Specs for the relevant changes

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