Validate External Users claim types in Authentication (method) test

[ErikAndreas]

Having claims set for redemption and link (Create External Users settings blade/tab) claim types, it would be nice to have those claims validated or checked when testing an Authentication method (upparty).

E.g., when clicking the 'Test Application' link on Authentication method the system would

• check to see that any configured redemption or link claim types are in the response (and warn if not present)
• optionally, check the origin type for possible misconfigurations such as using SAML transient nameid for sub (might be more than this one...)