Dragging InstanceListEntry components from library under an existing InstanceList node should add the new items to instances property

Dragging InstanceListEntry components from library under an existing InstanceList node should add the new items to instances property

Note that there is a generic task (QDS-4969) for inserting new components to suitable properties, but it's unclear if that supports inserting into lists also. It should be checked if a generic solution would work before implementing anything custom for this.