Add work items assignees mock query
What does this MR do and why?
This MR adds mock data about assignees to the work item query and implements the first iteration of displaying assignees on the work item detail view. This iteration includes only showing an example of an assignees list with popovers for both desktop and mobile views. Please keep in mind that mock assignees have unmatching popovers because popovers use the real user ID to fetch data and assignees are not "real" users.
Screenshots or screen recordings
| Mobile | Desktop | Desktop with popover |
|---|---|---|
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How to set up and validate locally
- Enable the work items feature flag and work item assignees feature flag
Feature.enable(:work_items) Feature.enable(:work_item_assignees) - Open work item view in the modal or standalone page
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #334810 (closed)
Edited by Natalia Tepluhina