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 #2542748 by plach, effulgentsia, jhedstrom, Gábor Hojtsy, alexpott, mpdonadio, catch, dawehner: Automatic entity updates can fail when there is existing content, leaving the site's schema in an unpredictable state

Issue #2535082 by alexpott, jhedstrom, xjm, plach, Fabianx, effulgentsia, Berdir: Allow hook_update_N() implementations to run before the automated entity updates

Issue #2333113 by effulgentsia, plach: Add an EntityDefinitionUpdateManager so that entity handlers can respond (e.g., by updating db schema) to code updates in a controlled way (e.g., from update.php).