swh.loader.git: improve robustness of loading
When a transaction fails, for instance when the same file is added by two concurrent workers, the loading isn't retried. We should do that.
Migrated from T50 (view on Phabricator)
When a transaction fails, for instance when the same file is added by two concurrent workers, the loading isn't retried. We should do that.
Migrated from T50 (view on Phabricator)