Issue #3222251 by bbrala, longwave: [November 8, 2021] Replace all isset constructs with the null coalescing operator

Issue #2907282 by BramDriesen, joachim: EntityTypeBundleInfoInterface::getBundleInfo() param should say 'ID'

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #1919468 by alexpott, Berdir: EntityManager::getAllBundleInfo() adds default entity_type_id bundle for entity types with bundles

Issue #2337191 by tim.plunkett, dawehner, jibran, yched, Wim Leers, catch: Split up EntityManager into many services