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phabricator: add a config knob to create obsolete markers when importing

Authored by mharbison72.

Description

phabricator: add a config knob to create obsolete markers when importing

This too can get a tristate switch if desired. But if so, that needs to happen
by having evolve add the option.

Differential Revision: https://phab.mercurial-scm.org/D8138