Make UserExtractor#initialize the same as CE

What does this MR do?

While this code was backported to CE in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/25741, we forgot to change the initialize method in EE to be the same as in CE.

What are the relevant issue numbers?

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

Does this MR meet the acceptance criteria?

• 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