[FIX] webservice: fix test failure with extended auth types

The test `test_oauth2_flow_compute_with_ui` iterates over all available `auth_type` values.

When a module extends `webservice` with an additional `auth_type` (e.g., `client_certificate`),
this test fails because it does not know how to populate the new required fields for that type.

This commit restricts the test loop to the authentication types defined in `webservice` module.

Author: vvrossem

webservice/tests/test_oauth2.py

@@ -285,7 +285,7 @@ def test_oauth2_flow_compute_with_ui(self):
         form_xmlid = "webservice.webservice_backend_form_view"
         for auth_type, oauth2_flow in [
             (tp, fl)
-            for tp in ws._fields["auth_type"].get_values(ws.env)
+            for tp in ["none", "user_pwd", "api_key", "oauth2"]
             for fl in ws._fields["oauth2_flow"].get_values(ws.env)
         ]:
             next_ws_id = ws.sudo().search([], order="id desc", limit=1).id + 1