Migrate workspace breadcrumbs to single nav option

What does this MR do and why?

Migrate workspace breadcrumbs to single nav option

References

Screenshots or screen recordings

Before After
Screenshot_2025-05-13_at_15.26.30 Screenshot_2025-05-13_at_15.25.59

How to set up and validate locally

  1. Check out this branch
  2. in the GDK, visit https://gdk.test:3000/-/remote_development/workspaces/new
  3. Inspect the breadcrumbs in devtools. You will see that a single <ol> in a single <nav> is used to render them.

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 #539583 (closed)

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