Clean up `write_project_authorizations_is_unique` feature flag
What does this MR do and why?
Cleans up the write_project_authorizations_is_unique
feature flag introduced by !130299 (merged). The flag was toggled this Wednesday, Sep 13th. Feature flag was introduced in %16.4.
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Related to #424097 (closed)
Edited by Dominic Bauer