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copies: extract value comparison in the python copy tracing

Authored by marmoute.

Description

copies: extract value comparison in the python copy tracing

This mirror what we did in the Rust code. This is useful to prepare rework for
this comparison logic that we will need to handle more advanced chaining cases
(when merges are chained).

Differential Revision: https://phab.mercurial-scm.org/D9590