Fix new namespace page breadcrumbs when project studio is enabled

Chad Lavimoniererequested to merge
20250903-clavimoniere-project-studio-fix-new-namespace-breadcrumbs into master

What does this MR do and why?

Fix new namespace page breadcrumbs when project studio is enabled

Changelog: fixed

References

Screenshots or screen recordings

Scenario Before After
project studio OFF (no change) gdk.test_3000_projects_new_namespace_id_33__2_ gdk.test_3000_projects_new_namespace_id_33__1_
project studio ON gdk.test_3000_projects_new_namespace_id_33__3_ gdk.test_3000_projects_new_namespace_id_33

How to set up and validate locally

  1. Check out this branch
  2. Ensure the project studio setting is ON
  3. Visit a new project or group page, for example https://gdk.test:3000/projects/new?namespace_id=33
  4. The breadcrumb will be in the expected place

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 #548836 (closed), https://gitlab.com/gitlab-org/gitlab/-/issues/567702

Edited by Chad Lavimoniere

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