vault: Fix tests data initialization after git loader api changes
Note: Build expected to fail for now (need to tag swh-loader-git)
Related to swh-loader-git!129 (closed) Related to T2134
Test Plan
tox
Migrated from D2412 (view on Phabricator)
Note: Build expected to fail for now (need to tag swh-loader-git)
Related to swh-loader-git!129 (closed) Related to T2134
tox
Migrated from D2412 (view on Phabricator)