Issue #2821499 by jungle, Andy_D, nikitagupta, lomasr, bbombachini, alexpott, andypost, Mile23, quietone, Sophie.SK, mtodor, barone, kuldeep_mehra27, vsujeetkumar, swatichouhan012, jhodgdon: Enable phpcs rule DrupalPractice.InfoFiles.NamespacedDependency

Issue #3072702 by alexpott, Wim Leers, mikelutz, xjm, catch, Berdir, tedbow, webchick, shaal, Mixologic, heddn: Core extensions should not need to specify the new core_version_requirement in *.info.yml files so that 9.0.x can be installed