config: replace experimental.stabilization by experimental.evolution
We replace 'experimental.stabilization=all' by 'experimental.evolution=true'
as we will extract individual config in their own config in later patches.
Differential Revision: https://phab.mercurial-scm.org/D1148
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}