Ignore fake emails in user search and typeahead #4889
Description
In organizations where emails are not public, we create fake "emails" with unique user IDs. At present, these emails are queried in user search and typeahead, which is certainly not what the user intends. Along with #4869, it makes user search feel "broken".
If email address visibility for an organization is something other than "everyone", we should ignore the email field in user search.