feat(config): remove deprecation warning for auth-type

[darcyclarke]

Summary

Previously we added a deprecation warning for auth-type as it was a config queued to be removed but we've recently shipped webauthn support under this config meaning it likely needs to persist for some time beyond the next major

Exit Criteria

• consider changing the deprecation warning to just display when sso, saml or oauth values are passed to auth-type (this provides us with a path forward to consolidating these values into a singular legacy option)

[wraithgar]

we log deprecation on the auth values now.