cli.add_forge_now: Allow queue name prefix override
This will allow to schedule add-forge-now requests to different queues. For example [1] will send git tasks to the add_forge_now_slow:swh.loader.git... queue.
That queue being configured to be consumed by worker with a different, e.g. a slow, workload than the standard one.
[1]
swh ... add-forge-now ... \
--preset $ENVIRONMENT \
schedule-first-visits \
--type-name git \
--prefix-queue add_forge_now_slow
Edited by Antoine R. Dumont