feat: add scheduler region choice different from workflow's one

[rguillome]

This PR allow to specify a region for the cloud scheduler Job different from the Workflow's one.

For example, you might need to deploy the job in a different region than the workflow since the Cloud Scheduler service is not available here (ex: europe-west9)

Add tests and example associated with this situation and so, needs to add an output to filter the scheduler job in tests with the defined region