Feature flag cleanup geo_group_wiki_repository_replication
What does this MR do and why?
The feature has been released in GitLab %13.10, see !56247 (merged) and gitlab-com/www-gitlab-com!76716 (merged). So now it's time to remove the feature flag definition.
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 issue
Related to #347061 (closed)