Change auth flow if account does not exist during sign in

[benmalcom]

This PR changes the authentication flow when a user without an account tends to sign in, once we can't find the account of this user in the AuthCallbackPage, we show the CreateAccountForm and populate it with their intended details.

Follow this I extracted the create account process in to a form to be reused and performed some other related refactors.

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Name	Status	Preview	Comments	Updated (UTC)
fast-auth-signer	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 19, 2024 7:35pm

[hcho112]

@benmalcom I just tried on this PR locally and it is working as expected. Only thing that I would like to see as improvement is that is it possible to directly create an account from below page to next instead of double verification on email?

[benmalcom]

@hcho112 if I get what you're saying, you think it will be okay to directly create an account since they're already coming to this page from their inbox which proves they own the email right?

[hcho112]

@benmalcom yes! Initially I was little concern about this might expose email being used. However, I realise that in order to get to next step, they need to verify via given email first so we don't have to worry about security. If so, next thing came to my mind is UX there from user perspective, they already proven that they are the owner of the email, therefore we should allow them to create account without double verifying it

[benmalcom]

@esaminu what do you think?

[benmalcom]

Fixed

[hcho112]

Also tests are failing, would it be to do with flaky? or actual failure?