Issue #2655076 by tedbow: Form settings title and only override widget if entity reference target is moderation_state

Fixed bug where fields were not mapped if added directly on add on type add form from 'Manage Fields' page on target entity.

Issue #2652512 by tedbow: Created ScheduledUpdateTypeBaseForm and ScheduledUpdateTypeAddAsFieldForm to separate out logic when adding update type from manage field page

Issue #2647090 by tedbow: In independent updates allow user to restrict bundles that can be referenced and cardinality