Show Parent Information In Work Items Views

What does this MR do and why?

This MR adds parent information display across multiple work item views to help users understand item hierarchy without needing to navigate away from their current view.

Key Changes Summary

• Added parent information display to work items list view, linked items widget, and child items widget
• Created ParentPopover component showing detailed parent info on hover (status, assignees, milestone, dates)
• Created WorkItemParentMetadata component with parent icon + truncated title link

GraphQL Updates:

• Extended query-specific fragments to fetch parent data (id, title, webUrl, reference, workItemType)
• Separated query and mutation fragments to prevent Query too large errors

Testing:

• Added a comprehensive test suite for the WorkItemParentMetadata component
• Updated existing tests with parent field support
• Enhanced mock data with parent objects

References

#10482

Screenshots or screen recordings

How to set up and validate locally

1. Check out this branch.
2. Navigate to the Work Items view.
3. Create a new work item.
4. Ensure the work item has the following fields labels, assignees, milestones, weight, date, and any other relevant fields applied.
5. Select the newly created work item to open its details page.
6. In the Child Items or Linked Items widget, click the Add button and choose Add existing task.
7. In the input field, search for and select an existing task.
8. Click Add task to link the selected task.
9. Verify that the newly linked task is assigned a parent item.
10. Hover over or focus on the Parent field and verify that the popover is displayed as seen here.
11. Navigate back to the Work Items list page.
12. Verify that the newly added child/linked item displays its parent item.
13. Hover over or focus on the Parent field and confirm that the popover is displayed correctly.

TODO: ⚠️ If #393558 (closed) is completed, the Parent display option will be off by default for the Child items widget.

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 #10482