Issue #2976103 by amateescu, catch, tstoeckler, alexpott: Make it possible to retrieve all the last installed entity type definitions at once from the update manager

Revert "Issue #2976103 by amateescu, tstoeckler, alexpott: Make it possible to retrieve all the last installed entity type definitions at once from the update manager"

This reverts commit 246e95d4.

Issue #2976103 by amateescu, tstoeckler, alexpott: Make it possible to retrieve all the last installed entity type definitions at once from the update manager

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

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