Fetch users e-mail address from Altinn profile into receipt page

[Febakke]

Description

As a user I want the option to be able to receive a copy of the PDF receipt on email.
As a user I want my e-mail to pre-filled after I submit a form. This e-mail address is for sending a receipt of a completed form.

Screenshots

The screenshots shows the actual contact information values available on the profile, and is not intended for implementation in an app. The values are fetched from Kontakt- and reservasjonsregisteret (KRR).

Considerations

There is a flag on the profile saying 'Jeg ønsker kvittering på e-post for innsendte skjema'. Although this states that the user always should get a receipt on e-mail if checked we probably need a way to opt-out of this for the application developers as we have scenarios where a receipt is not relevant.

Acceptance criteria

• The e-mail address should be pre-filled with the users registered e-mail
• If the user has checked the 'Jeg ønsker kvittering på e-post for innsendte skjema' on the profile that should be respected by default

Related issues

• Blocked by: Support for sending of email notification to known email address altinn-notifications#148

Tasks

• Look into how this should work if the user is representing an organization.

[FinnurO]

Related to profile options where a user can set that receipts should be sent to KRR e-mail.