Breadcrumb on Admin Runner page

What does this MR do?

Sets a breadcrumb on Admin Runner page.

Are there points in the code the reviewer needs to double check?

n/a

Why was this MR needed?

Since GitLab 10.0 we had the wrong breadcrumb on Admin Runner page.

Screenshots (if relevant)

before	after

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [n/a] Documentation created/updated
• [n/a] API support added
• [n/a] Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • [n/a] Has been reviewed by Backend
  • [n/a] Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• [n/a] End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

Closes #43717 (closed)