Was removed by mistake at some time in the past. Introduced a few tests
to ensure that things work as expected.

Resolves: GREG-223

If someone that already exists in greg follows an invite, we are kind
enough to give the new role to the existing person. This introduced a
security risk if the invitation was actually meant for someone else.

Because of this situation, we introduce a security mechanism where we
disable the invitationlink if the name of the existing person is too
different from the name used in the invitation.

Resolves: GREG-166

Changed from "IDporten user" top "ID-porten user"..
Assume the login is using ID-porten when only a nin is present.
The claims in a normal feide login will never contain nin.

Issue: GREG-105

Issue: GREG-121-FEIDE-EMAIL

GREG-85: Adding some more data when Greg user profile is created. Doing some checks on fnr in invitation endpoint

Issue: GREG-36

Issue: GREG-36

Issue: GREG-36