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copies-rust: process copy information of both parent at the same time

Authored by marmoute.

Description

copies-rust: process copy information of both parent at the same time

This avoid a double iteration and this open the way to a better handing of
deletion. That better handling of deletion is the core reason we are doing this
refactoring.

Differential Revision: https://phab.mercurial-scm.org/D9650