Don't allow users with unverified emails to upload at all #4292
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This will further expand the actions that a user without a verified email address cannot do, to uploading any file at all. Since this is the primary thing that people tend to do with PyPI (at least for the people for whom having a user account is very important), this should act as a strong forcing function to get people to verify their email address.
This does take a stronger stance that the old code did, instead of simply allowing any verified email, it explicitly checks to see if the primary email address is verified. The primary email address is the only one that we are going to attempt to send emails to, so it is the most important one to ensure remains valid.
This further progresses #3632.