tests: add check on behaviour of OICDClient's clean (#77452)

It was reported that POLICY_UUID and AUTHORIZATION_MODE_NONE were
incompatible when redirect uris with different domains were used but it
is not the case.

tests/idp_oidc/test_misc.py

@@ -1831,6 +1831,12 @@ def test_oidc_client_clean():
             identifier_policy=OIDCClient.POLICY_PAIRWISE,
         ).clean()
 
+    OIDCClient(
+        redirect_uris='https://example.com/ https://example2.com/',
+        identifier_policy=OIDCClient.POLICY_UUID,
+        authorization_mode=OIDCClient.AUTHORIZATION_MODE_NONE,
+    ).clean()
+
     OIDCClient(
         redirect_uris='https://example.com/ https://example2.com/',
         sector_identifier_uri='https://example.com/',