Mobile-friendly table on Admin Runners

What does this MR do?

Makes the admin runners table mobile friendly (follow-up from this community contribution)

Screenshots (if relevant)

Before	After

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?

closes #33848 (moved)