It's hard to cancel derivations sometimes

[roberth]

Description

A new job is required in order to cancel derivations that were restarted after all jobs that needed them were cancelled

To Reproduce

Cause 1: restarting just the builds

1. Start a job with derivations that have a system for which the cluster has no agents
2. Cancel the job. This will remove the ability to cancel the job's derivations next time.
3. Restart the job. This will queue the cancelled derivations.
4. Don't have a way to cancel those derivations now.
5. (workaround) Restart the job, let it evaluate completely, then cancel it.

Cause 2: undispatchable jobs don't appear on job page
This would have allowed bootstrap-tools.drv to be cancelled individually, trickling down to the whole tree of non-dispatchable derivations.

Expected behavior

Logs

Platform / Version

Best to go to https://hercules-ci.com/dashboard and click on the agents' tab for the account you're interested in.
hercules-ci-agent --help version