Resolve "Group runner confused about whether or not is protected"

What does this MR do?

Fixes the bug in rendering Runner's details page, described in #52840 (closed). Additionally it adds tests for this view.

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides

Closes #52840 (closed)