Database schema diff 11 - A different index name: index_emails_on_email (source) vs emails_email_key (production)

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Issue to address gitlab-ce~3098698 schema difference 11 in https://gitlab.com/gitlab-org/gitlab-ce/issues/51438#current-differences

A different index name: index_emails_on_email (source) vs emails_email_key (production)

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