Activatable Entity: support for union entities

[01es]

Description

Union entities may have union properties that are of activatable nature. This means that there can be a link (edge) between activatable entity instances via an association of a union type.

At the moment such links are not tracked. The implication of this is that there could be an active reference to an active activatable entity from an active activatable entity as a union property of some union type that would not count towards an active dependency and would not prevent deactivation of that active entity.

The logic for handling activatable dependencies needs to be enhanced to support union entities.

Expected outcome

Fully functional handling of activatable dependencies in application to union entities.