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Properly handle transplant_source in changeset extra fields

Antoine Lambert requested to merge generated-differential-D1507-source into generated-differential-D1507-target

Mercurial changeset can contain extra data in it, notably a transplant_source field referencing another changeset id. In contrary to other extra fields, this one stores the changeset reference in binary instead of using the hexadecimal representation.

So to ease original changeset extra data exploitation and avoid decoding errors, prefer to store the hexadecimal representation of the changeset id in the swh revision metadata.

Related #1729 (closed)

Test Plan

A new test case has been added.

Migrated from D1507 (view on Phabricator)

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