Check work_items_hierarchy FF against group actor
What does this MR do and why?
It changes work_items_hierarchy
FF check and now checks it against group instead of project actor.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #369088 (closed)