Staging instance, all changes can be removed at any time

Mercurial loader: release target is invalid

Each release generated by the mercurial loader point to an invalid revision target, see for instance https://archive.softwareheritage.org/browse/origin/https://273280703-shooter-player.googlecode.com/hg//

It seems that the original hg changeset id (read from .hgtags) is used as the revision identifier instead of a swh one.

Migrated from T1155 (view on Phabricator)