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urlutil: add a `get_pull_paths` to perform the pull destination logic

Authored by marmoute.

Description

urlutil: add a get_pull_paths to perform the pull destination logic

As is this changeset does not change anything. However having an official empty
point will help unifying the logic and encapsulate the details and update the
logic to support path definition pointing to multiple other path.

Differential Revision: https://phab.mercurial-scm.org/D10378