fix: in-app redirect existing email

[sshanzel]

Changes

• Same issue fixed here: bbeafda
  • Where the user is trying to login with an email that is already associated with another account.
• The only difference here, this is to fix the redirect flow because we now have to support auth for both redirect and callback postMessage :hide_the_pain:
• Context: when a user from Facebook in-app browser tries to login, and the case above happened, the user should be redirected to the params we sent (redirect_to or return_to) - those params when initializing a flow will only be utilized when the flow was successful. With the edge case above, it is considered a failed flow so the redirection falls back to our callback page instead of the redirect params we sent.
• Using session storage is ideal since the data goes away after closing the browser which is basically the same as closing the in-app browser.
• We also added a process to utilize the flow sent by the failing attempt so we can display the error message.

Events

Did you introduce any new tracking events?

Experiment

Did you introduce any new experiments?

Manual Testing

Caution

Please make sure existing components are not breaking/affected by this PR

Preview domain

https://fix-facebook-redirect-fail.preview.app.daily.dev

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[sshanzel]

Just to ensure the storage is clean until interaction starts.

[rebelchris]

Just make sure to do critical flows