Remove FF_ENABLE_PLACEHOLDERS
Follow-up from #619 (closed).
The flag should be removed in a few milestones, e.g. in %14.5
TODO
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Remove the feature flag from internal/feature/feature.go
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Remove its usage on internal/redirects/matching.go:48
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Remove relevant tests -
Update version history in docs - https://docs.gitlab.com/ee/user/project/pages/redirects.html#rewrites > - [Generally available](https://gitlab.com/gitlab-org/gitlab-pages/-/issues/620) in GitLab XX.X. Feature flag `FF_ENABLE_PLACEHOLDERS` removed.
Edited by Ashraf Khamis