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tests: split out tests for unrelated copy source/target into separate file

Authored by martinvonz.

Description

tests: split out tests for unrelated copy source/target into separate file

I've realized only recently how many cases there are where a file is
treated differently if it's considered "related" to another file (not
deleted and re-added). I'll add more tests for some of these cases
soon.

Differential Revision: https://phab.mercurial-scm.org/D6598