Show email addresses of members in Work Manager #1537
Description
REF: https://topcoder.atlassian.net/browse/PROD-4269
On the Registrants tab and Submissions tab for an active challenge, we want to add the user email address of each registrant or submitter, next to the Username field. We show this in Online Review to copilots and managers, so this information should be available to WM as well.
