The Parsoid JS service is no longer supported or used in production, and users should use Parsoid PHP instead, via the rest.php endpoint. Parsoid is also now a dependency of core, so there is no need for a separate Parsoid role.
See these changes to the documentation: https://www.mediawiki.org/w/index.php?title=Parsoid&type=revision&diff=4040744&oldid=3985852&diffmode=visual