Expose work item state separately on WorkItemWidgetLinkedItems.linkedItems

Summary

The LinkedWorkItemType field that's part of WorkItemWidgetLinkedItems does expose workItem connection which can be used to access additional data for a given work item but since the information is nested deeply, it causes query depth to exceed its maximum limit, we're running into this while developing frontend for #474940 (closed). So along with workItem, if it additionally exposes workItemState (or linkState), it would make access much easier for frontend to consume.

Implementation

The change is probably required in types/work_items/linked_item_type.rb where we can expose this property.