Issue #2044367 by InternetDevels, Berdir, wildflower_0002, ianthomas_uk, ParisLiakos, Xano | cosmicdreams: Replace calls to lock() with \Drupal::lock().

Issue #2037569 by tstoeckler, ParisLaikos, wildflower_0002, pfrenssen, tim.plunkett: Remove design_test module.