Fix runner summary badge alignment

What does this MR do and why?

Fixes runner summary badge alignment, found during rollout at #371031 (closed)

Screenshots or screen recordings

before	after

How to set up and validate locally

Admin Runners:

1. Enable the new layout

   Feature.enable(:runner_list_stacked_layout_admin)

2. Visit admin runners page at Admin -> Runners (e.g. http://gdk.test:3000/admin/runners)

3. Check the layout

   1. If no runners are registered, follow the instructions in "Register instance runner"

Group Runners:

1. Enable the new layout

   Feature.enable(:runner_list_stacked_layout)

2. Go to Group -> CI/CD -> Runners

3. Check the layout

   1. If no runners are registered, follow the instructions in "Register group runner"

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 #371031 (closed)