Update FF's with user actor

What does this MR do and why?

Update FF's with user actor

Updates FF simplified_labels & simplified_badges to use an actor so we can better scope the release of those features as we'd like to scope it to specific users first and then to gitlab_team_members before releasing it to the public.

Original FF MRs: !140231 (merged) & !140239 (merged)

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

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Related to #430246 (closed), #438232 (closed)