If a changeset have been submitted to Phabricator and a new version is pushed to
heptapod, we should refresh the state on Phabricator. If we do not do this, they
are a risk of an older version being applied from Phabricator. In this situation
content-divergence will be (rightfully) detected by evolution.
We only refresh the Diff if the test pass, to avoid updating Phabricator with