Convert groups CSS to utility classes

What does this MR do and why?

This MR converts some global CSS to utility classes

Screenshots or screen recordings

No visual changes, except the No groups matched your search which was converted to the closest Pajamas colour

before	after

How to set up and validate locally

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.