Update admin health check page UI

What does this MR do and why?

Clean up admin health check page UI

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Before	After

How to set up and validate locally

Go to http://gdk.test:3000/admin/health_check

#457239 (closed)