ISTWCMS-5234: adding hook to add validation to nodes for media

uw_cfg_common.module

@@ -1044,3 +1044,14 @@ function uw_cfg_common_webform_build_access_denied_alter(array &$build, WebformI
     ];
   }
 }
+
+/**
+ * Implements hook_entity_type_alter().
+ *
+ * @param array $entity_types
+ */
+function uw_cfg_common_entity_type_alter(array &$entity_types) {
+
+  // Add validation constraint to the node entity.
+  $entity_types['node']->addConstraint('UwMedia');
+}