[WS2] System Defined Types Integration
#### Current work items state
* **Incidents:** Work items but not fully widgetized (can't use work item detail view), so `useLegacyView: true`, locked from customization
* **Tickets (Service Desk):** Will be fully functional work items eventually, but customization locked for now, creation disabled until required widgets are figured out
* **Test Cases & Requirements:** Work items but don't use the work item detail/list views and shouldn't appear in the general work item list
* **Tasks & Issues:** Fully functional work items with no restrictions
* **Epics:** Work items but group-level only currently, locked for customization right now
* **Objectives/Key Results:** Hidden behind feature flag, future unclear, customization restricted but are fully functional work items
epic