As a user, I would like to get intuitive error messages if one of the resources I am using does not exist (workflow, project)

[cgpu]

When the project or workflow don't exist, the suer doesn't get any intuitive feedback.

Some ideas below and we can discuss what is better for the users:

Add if clauses early to catch with workflow list or project list (note, we need to implement this as well), and if they don't exist

1. fail early and give the user an intuitive message that nudges them to first create them and then submit the job
2. create the project silently to abstract this from the user (the workflow could be defined as the repo link)