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locking: wait for locks in `hg cp` and `hg mv`

Authored by spectral.

Description

locking: wait for locks in hg cp and hg mv

I traced this back to revision 1822 (64df422), and there's no explanation why we
would prefer to error out instead of waiting for the locks.

Differential Revision: https://phab.mercurial-scm.org/D8464

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