rust-dirstate: rename `has_dirstate_v2` to `use_dirstate_v2`
It is closer to the right semantics. I added a docstring to better explain
the reasonning. In the next patch(es), I will address the underlying issue
of finding the "wrong" version of the dirstate on disk.
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}