Issue #2475263 by LKS90, Berdir: Remove Role::postSave() method

core/modules/comment/comment.routing.yml

core/modules/comment/src/Controller/CommentController.php

...c/Plugin/Field/FieldFormatter/CommentDefaultFormatter.php

core/modules/comment/src/Tests/CommentAnonymousTest.php

core/modules/comment/src/Tests/CommentInterfaceTest.php

core/modules/comment/src/Tests/CommentNonNodeTest.php

core/modules/user/src/Entity/Role.php