BUGFIX: Explicit value object support for node properties

[mhsdesign]

Previously this logic was triggered implicitly though the property mapper, but as this is such a primary use case and requires special behavior in the serializer: https://github.com/neos/neos-development-collection/pull/4638 there should be an obvious code flow.

This change does not modify behavior but equals having the DenormalizingObjectConverter priority set to infinity :D