Add journey: Set the email address completed forms will be sent to

[christophercameron-ixd]

This issue is to implement the journey for "I need to set the email address a completed form is sent to (trello)".
Mural link to screen flow

Set the email address for completed forms

If we already hold an end point email address we should show the "Are you sure you want to change this email address?" screen, displaying the email they have previously added. Otherwise, we can go to the "Confirmation code sent" screen to finish this part of the journey.

Are you sure you want to change this email address?

This screen should include both the previously added email in full and the one they have entered and would replace it.
If users are presented this screen we want to confirm if they are happy to change the email or not. If they select "Yes" we should continue them through the journey to the "Confirmation code sent" screen. Otherwise, we should take them back out to the Form overview screen.

Confirmation code sent

This page includes text that says "We've sent a confirmation code and your email address to [email@address.com]. The recipient will be asked to give you the code. You need to enter the code to confirm the email address. The code is valid for 7 days." There are two links underneath that say, "Enter confirmation code to verify the email address" and "Go to form overview"

This is the end of this part of the users journey. They have a link that will allow them to return to the form overview screen OR a link to allow them to enter the confirmation code to verify the email address (separate issue) - this will cover scenarios where the form creator is within the team/has been given access to the processing inbox, or is wanting to test the end to end form submission journey including what the email will look like.

Screen flow diagram

The journey will end with an email being sent to the email provided, the content of which will be created and added to another github issue.