EE: resolve remaining CE to EE differences in lib/

What does this MR do?

This resolves remaining differences in the lib/ directory, excluding those taken care of in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/26369 and https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/10326.

TODO

• lib/gitlab/view/presenter/delegated.rb
• lib/tasks/gitlab/cleanup.rake
• lib/tasks/gitlab/info.rake

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/9505

Does this MR meet the acceptance criteria?

• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Security reports checked/validated by reviewer