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copies: split creation of the graph and actual checking again

Authored by marmoute.

Description

copies: split creation of the graph and actual checking again

The re-install the old split. It will be necessary to test that the upgrade
process produced a functionally identical result. It will be useful to detect
case where the metadata we look at identical, but some other items we did not
checked are missing.

(spoiler: we will find some bug)

Differential Revision: https://phab.mercurial-scm.org/D9195