Elliotte Rusty Harold opened MNG-6579 and commented
org.apache.maven.repository.internal.MavenRepositorySystemUtils is essentially mandatory for using the resolver. Without it you can't create a RepositorySystem, a ServiceLocator, or a RepositorySystemSession; all of which are needed before you can resolve an artifact.
This functionality should be available in a non-internal package.
No further details from MNG-6579