Clean up the swh.scheduler / swh.storage pytest plugin imports
same stuff as swh-loader-mercurial!118 (closed)
Test Plan
tox
Migrated from D3487 (view on Phabricator)
Staging instance, all changes can be removed at any time
same stuff as swh-loader-mercurial!118 (closed)
tox
Migrated from D3487 (view on Phabricator)