Remove members_with_shared_group_access feature flag
What does this MR do and why?
The feature is fully rolled out and stable.
How to set up and validate locally
Follow the steps given in #377922 (closed)
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 #398621 (closed)