Deploy latest swh.loader.core and swh.lister

loader:

• loader.core doc improvment on the package loader tutorial
• fixes for the loader debian
• fix for the package loader in general (nixguix currently impacted)

lister:

• new maven lister
• drop unnecessary parameter in the debian lister (this actually implies data migration in the current listed origins in the scheduler)

Plan:

• tag
• unstuck builds if any (there is, the lister failed already [1])

staging (and production):

• migrate scheduling db data (drop the date field in the extra_loader_arguments for deb listed_origins) [4]
• deploy lister
• restart lister service
• deploy loader core
• restart package loader services
• wait for scheduling of tasks to happen (it does not)
• unstuck task type mess (load-deb-package instead of load-deb which prevents load debian task scheduling from happening) [5]
• we good? yes, see #3765 (closed)

Checks:

• ensure deb loading origins are actually scheduled now [2]

• ensure the nixguix loader actually finish loading now [3]. It does [6)

• [1] https://jenkins.softwareheritage.org/job/debian/job/packages/job/DLS/job/gbp-buildpackage/161/console

• [2] Related to #2400 (closed)

• [3] Related to T3763

• [4] migrated/migration$1222

• [5] Install latest version of the loader.core package in the scheduler node and trigger the task type registering

swhscheduler@scheduler0.staging $ swh scheduler --config-file /etc/softwareheritage/scheduler/backend.yml task-type register

• [6] migrated/migration$1224

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Migrated from T3765 (view on Phabricator)