EE: Resolve EE differences in the lib/ directory

What does this MR do?

This resolves the remaining differences between CE and EE in the lib/ directory.

This fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/13335

CE MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31582

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content