Add missing actor to group_runner_view_ui feature flag

What does this MR do and why?

Add missing group actor to group_runner_view_ui feature flag

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 #364811 (closed)