Work items list [FE] - Add Health Status filter
## Summary
Add Health Status filter component to work items list UI as part of https://gitlab.com/gitlab-org/gitlab/-/issues/536876
## Backend Support
Backend support is complete via https://gitlab.com/gitlab-org/gitlab/-/issues/510269
## Implementation Details
- Add Health Status filter component to work items list UI
- Support filter operations:
- Equals (on track, needs attention, at risk)
- Not equals
- Wildcard (enum: any/none)
- Update filter state management and GraphQL queries
- Integrate with existing filter system
## Acceptance Criteria
- [x] Health Status filter is available in work items list(epic list included)
- [x] All filter operations work correctly (is, is not)
- [x] Filter integrates with existing filters
- [x] Filter state is persisted in URL
- [x] Unit tests added
- [x] E2E tests updated
## Related Issues
- Parent: https://gitlab.com/gitlab-org/gitlab/-/issues/536876
- Backend: https://gitlab.com/gitlab-org/gitlab/-/issues/510269
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