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Use versioned ExtIDs in loader mercurial implementation

Antoine R. Dumont requested to merge generated-differential-D6036-source into generated-differential-D6036-target

For now this hardcodes the version to 1 be it to read or store extids.

This allows:

  • store the new hashes with a version (actually no version means version 0).
  • to keep the old loader mercurial ExtID references in the archives (no need to clean them up as that poses other problems regarding the journal)
  • in effect unblock the current ingestion/updates of existing origins which already have more than one ExtIDs due to different incompatible versions.

The storage implementation does not allow filtering on the extid_version so it's up to the loader to do the filtering. Hence the current implementation.

Related to T3418 Depends on D6040

Test Plan

tox

Migrated from D6036 (view on Phabricator)

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