Enable email sending with emails in body

[kleivane]

Description

We are using the notification api to send emails to customer service. In the form users have filed an email were they can be reached. These emails now fail and we need to rewrite emails to name.lastname att organization dott org. And customer service needs to rewrite back to [email protected].

Additional Information

This worked in June-24 and was used in application kyv/tilgangsoknad-pilot , now digdir/tilgangssoknad . https://altinn.slack.com/archives/C02EJ9HKQA3/p1726485543751009

[olebhansen]

Adding some background: The rationale for introducing the validation is that in Altinn3, all content is user-defined, wheras in Altinn2 this is a "managed process". As far as we could see, there were no use of links/emails (in line with the content guidelines; https://altinn.github.io/docs/utviklingsguider/varsling/#hva-skal-et-varsel-ikke-inneholde). Thus we enabled a hard enforcement of this. In retrospec we should have done more analysis of new/current Altinn3-usage, and also published/versioned the feature as a breaking change.

The "feature" was rolled back in #611

Keeping this issue open to track a long-term solution to this usecase.