Remove feature flag wiki_redirection
What does this MR do and why?
Remove feature flag wiki_redirection
This MR removes the feature flag wiki_redirection
that rolled out #257892 (closed) on production.
Related MRs: !150727 (merged), !153289 (merged)
Changelog: added
MR acceptance checklist
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Related to #460097 (closed)
Edited by Himanshu Kapoor