bzr: Update for swh.loader.core 3.0.0 and remove initialization boilerplate
Test Plan
will fail because it depends on swh-loader-core!283 (closed) being released
Migrated from D7614 (view on Phabricator)
Staging instance, all changes can be removed at any time
will fail because it depends on swh-loader-core!283 (closed) being released
Migrated from D7614 (view on Phabricator)