Make it clear Default compliance framework only works for group owners

What does this MR do and why?

Make it clear that when creating a project the user must be a group owner to set a default compliance framework

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

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 #394630 (closed)