send-to-celery: Adapt to schedule from lister name & instance_name
This allows to bypass the lister id retrieval step using directly the name and instance name of the lister to discover the uuid.
This also drops the --lister-uuid flag which is somewhat difficult to use.
Related to https://gitlab.softwareheritage.org/infra/sysadm-environment/-/issues/4674
Test Plan
Add new test ongoing
Migrated from D8922 (view on Phabricator)