Issue #2923004 by tedbow, bircher, samuel.mortenson, alexpott, Wim Leers,...

Issue #2923004 by tedbow, bircher, samuel.mortenson, alexpott, Wim Leers, axel.rutz, Berdir, borisson_, xjm, tim.plunkett: Add method to check if any overrides are applied to \Drupal\Core\Config\Config