Git loader implementations divergence point of attention

It appears both the from_disk [1] (swh.loader.git.from_disk.GitLoaderFromDisk) and the production (swh.loader.git.loader.GitLoader) implementations grew some objects check divergence.

Some checks are done in the from_disk implementation [3] that is not used in the main implementation (understand the one used in production).

One diff recently landed that increases that divergence [2].

• [1] One of the implementations used to ingest gitorious and googlecode git origins possibly.

• [2] !69 (closed)

• [3] https://forge.softwareheritage.org/source/swh-loader-git/browse/master/swh/loader/git/from_disk.py$0-129

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Migrated from T3472 (view on Phabricator)