For vector-2022 skin:
* MediaWiki:Vector.css and MediaWiki:Vector.js are added via the
existing ResourceLoader hook.
* User:<name>/vector.js and User:<name>/vector.css are added via new
VectorResourceLoader modules
Bug: T297758
Change-Id: I37e9a9d353695502213c7a651530995252d9505f
A new vector-2022 skin is added. This will be the eventual home
of the new Vector skin when we are ready to migrate.
Please see SkinVector class for the migration plan to simulate this
as part of testing.
Bug: T291098
Change-Id: Ibaddf94a5bfb5e21bbbaf1e0aa1b343a3f566d2d