Put organisations on the user model

As in other places, putting a model layer between the view and the API
client makes the code cleaner and clearer.

app/main/views/find_users.py

@@ -31,12 +31,9 @@ def find_users_by_email():
 @login_required
 @user_is_platform_admin
 def user_information(user_id):
-    user = User.from_id(user_id)
-    services = user_api_client.get_services_for_user(user)
     return render_template(
         'views/find-users/user-information.html',
-        user=user,
-        services=services,
+        user=User.from_id(user_id),
     )