We don't support mixed domains involving versions prior to WF 23, so remove all transformation testing uses of ModelTestControllerVersion enum values for releases prior to that.

Part of the goal here is to stop running such tests so we can remove some old controller versions from https://github.com/wildfly/wildfly-legacy-test, which in turn will let us prune long deprecated code in main (e.g. various AbstractControllerService constructors) that only exists to allow running transformation tests against old versions.