Remove invitations_member_role_id feature flag
What does this MR do and why?
It removes invitations_member_role_id
. We enabled the FF globally one week ago and there were no issues. We can now safely remove the feature flag.
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 #429879 (closed)