Display group related to a runner

What does this MR do and why?

This change renders the group that owns a runner in the runner details page.

backend MR: !78454 (merged)

Screenshots or screen recordings

Sub group display

How to set up and validate locally

1. With some group runners added (https://docs.gitlab.com/ee/ci/runners/runners_scope.html#group-runners)
2. In rails console ($ rails c) enable the the view runner page

   Feature.enable(:runner_read_only_admin_view)

3. Visit Admin -> Runners
4. Visit any Group Runner page such as http://gdk.test:3000/admin/runners/108

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #347856 (closed)