Migrate work item health status widget to MSW

What does this MR do and why?

Related to https://gitlab.com/gitlab-org/plan-stage/plan-engineering/-/work_items/1417

Migrates the work item health status widget from Capybara to an MSW integration test.

Third slice of the sidebar widget migration, after weight (!252836 (merged)) and iteration (!253470 (merged)). Status is next, in a separate MR.

References

• Parent issue: https://gitlab.com/gitlab-org/plan-stage/plan-engineering/-/work_items/1417
• Weight widget migration: !252836 (merged)
• Iteration widget migration: !253470 (merged)

Screenshots or screen recordings

How to set up and validate locally

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.