Remove references to gitlab_com_duo_pro_bulk_user_assignment
Resolves #419822.
What does this MR do and why?
This MR cleans up references to the following feature flag: gitlab_com_duo_pro_bulk_user_assignment
. Given it was referenced together with another FF inside a method, I chose to leave the full cleanup of the method itself for a future MR.
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How to set up and validate locally
Green CI.