cleanup: use revision numbers instead of hashes in test output
This allows changes to the hashes produced by fix to not needlessly modify this
area of the test.
Differential Revision: https://phab.mercurial-scm.org/D5244
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}