dirstatemap: add a common `_refresh_entry` method for dirstatemap This method is called once a DirstateItem have been modified to apply the change on the dirstatemap if necessary. Each variant have a different implementation (which is … the point). We use `addfile` for the rustmap and not `set_dirstate_item` because we need to keep the internal counter up to date and `set_dirstate_item` does not do it. Differential Revision: https://phab.mercurial-scm.org/D11571

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