Remove `config.action_dispatch.use_authenticated_cookie_encryption` configuration
The following discussion from gitlab-ee!12145 should be addressed:
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@jprovaznik started a discussion: Could we create an issue to not forget about this an schedule it on next milestone (from when this gets merged)?
This is the new default in Rails 5.2. We just set it to false
in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/12145 so that we can rollback safely and not invalidate all sessions.
After we are confident enough of the Rails upgrade, we can remove the config line here.