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narrow: add more status messages when narrowing

Authored by martinvonz.

Description

narrow: add more status messages when narrowing

Each of the steps I added status messages for in this patch frequently
take minutes or tens of minutes for our internal users.

It would be nice to also have a progress bar but that will have to
come later.

Differential Revision: https://phab.mercurial-scm.org/D10503