Clean up the swh.scheduler / swh.storage pytest plugin imports
Same as swh-loader-core!103 (closed) / swh-loader-svn!41 (closed)...
Test Plan
tox
Migrated from D3483 (view on Phabricator)
Staging instance, all changes can be removed at any time
Same as swh-loader-core!103 (closed) / swh-loader-svn!41 (closed)...
tox
Migrated from D3483 (view on Phabricator)