auto-upgrade: add a test that will host "quiet" testing
We will add options to suppress the message in the coming changeset. The changes
will be clearer if the full test is already in place.
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}