side-data: drop the associated config and requirements
This is no longer and extensions of revlog v1, but a part of revlog v2. We no
longer needs independent config and requirement management for that.
Differential Revision: https://phab.mercurial-scm.org/D10620
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}