Update FxA email link and give results for verified account info

Retrieve all accounts in the account info view but only list `'firefox-accounts'` or `'unknown'` as the source.

Update the FxA preverified email to send the user to sign up and prefill the email address.
this is as fine as is, i think in other JWT tests I just encoded the JWT in the test so you at least have something readable in the test