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Previously, our Github authentication backend just used the user's primary email address associated with GitHub, which was a reasonable default, but quite annoying for users who have several email addresses associated with their GitHub account. We fix this, by adding a new screen where users can select which of their (verified) GitHub email addresses to use for authentication. This is implemented using the "partial" feature of the python-social-auth pipeline system. Each email is displayed as a button. Clicking on that button chooses the email. The email value is stored in a hidden input above the button. The `primary_email` is displayed on top followed by `verified_non_primary_emails`. Backend name is also passed as `backend` to the template, which in our case is GitHub. Fixes #9876.