[Next] Add auto redirect when there is a single enabled auth integration (#2422)

* Add auto redirect when there is a single enabled auth integration

* fix: small syntax cleanup

src/core/server/graph/tenant/schema/schema.graphql

@@ -429,6 +429,13 @@ type SSOAuthIntegration {
   """
   allowRegistration: Boolean!
 
+  """
+  redirectURL is the URL that the user should be redirected to in order to start
+  an authentication flow with the given integration. This field is not stored,
+  and is instead computed from the Tenant.
+  """
+  redirectURL: String
+
   """
   targetFilter will restrict where the authentication integration should be
   displayed. If the value of targetFilter is null, then the authentication