Nette 3 + PHP 8

See merge request !2

postUpdate event is not triggered if new entity was created and stored in the DB

NetteCacheInvalidator: remove duplicate cache keys to clean + CacheSubscriber: prevent array_too_deep error

since get_called_class() is not safe cache key because of `Kdyby\GeneratedProxy\__CG__\...`

This reverts commit 26b9e4e2

Revert "If \traversable entity does not contains objects, does not look whether entity instance is managed"

This reverts commit 3d98e379

Fix cacheTags if entity is instanceOf Translatable

See merge request !1

E.g. after updated by Artfocus\Templates\Wysiwyg\Handlers\DoctrineHandler::update()