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copies-rust: use the `entry` API for copy information too

Authored by marmoute.

Description

copies-rust: use the entry API for copy information too

The code end up being complicated, but it split out the case were we add a new
entry from the case were we overwrite one. And that is the goal here, being able
to easily track value overwrite.

Differential Revision: https://phab.mercurial-scm.org/D9495

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