Draft: Add tests for group runners permissions

What does this MR do and why?

This change refactors some access control methods in the global application controller and adds some test to enforce the access control is maintained.

This adds a safety net before starting work on #384179 (closed)

Screenshots or screen recordings

NA

How to set up and validate locally

NA

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 #384179 (closed)