We migrated away from "local" a while back.

Related to T4228

Related to T4228

The case where the datastore already exists was masked by @functools.lru_cache,
which persists for the lifetime of a test, causing the function not to be
actually called twice.

Related to T3922

This is heavily inspired by https://archive.softwareheritage.org/swh:1:cnt:c6dda7698c6aecf71f744e4e4c01bc3e115db880;origin=https://forge.softwareheritage.org/source/snippets.git;visit=swh:1:snp:c2e3170b9927f3d356e120546b00f5a9d25a224c;anchor=swh:1:rev:fa9e387ba5e3470b93a5c5a8773ed598ef03d211;path=/vlorentz/analyze_consistency_failures.py
but reorganized to the database instead of ad-hoc text and pickle files.

Currently, this only implements recovering from Git origins.

as well as the run() method.

For consistency with a future module called fixer.py