Re-add index_users_for_auditors for GitLab.com

Jio Castillorequested to merge
readd_index_users_for_auditors_for_gitlab_com into master

What does this MR do and why?

Re-add index_users_for_auditors for GitLab.com to support listing auditors in the admin page. Discussion for context: !187612 (comment 2476571898)

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