To avoid huge workflows to block the worker, we will enqueue a new job
every 20 steps.
This could be more than 20 if there are branches but I think this is
fine, the goal is only to have a limit set.
Also cleaning a bit the code to mark running steps as failed when
workflow fails.
I tested it on a huge workflow:
https://github.com/user-attachments/assets/d7b8e345-d1a1-4467-96fd-92117b500120