Render tickets in work items view behind work_item_ticket_migration FF

What does this MR do and why?

Render tickets in work items view behind work_item_ticket_migration FF

Behind feature flag work_item_ticket_migration

References

• #630485

Screenshots or screen recordings

How to set up and validate locally

1. Enable the work_item_ticket_migration feature flag
2. Go to the work items list and open a ticket
3. Confirm it opens in the work item drawer

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #630485