Use a fully mocked credential (#45707)

tests/conftest.py

@@ -204,9 +204,13 @@ def mock_device_tracker_conf():
 @pytest.fixture
 async def hass_admin_credential(hass, local_auth):
     """Provide credentials for admin user."""
-    await hass.async_add_executor_job(local_auth.data.add_auth, "admin", "admin-pass")
-
-    return await local_auth.async_get_or_create_credentials({"username": "admin"})
+    return Credentials(
+        id="mock-credential-id",
+        auth_provider_type="homeassistant",
+        auth_provider_id=None,
+        data={"username": "admin"},
+        is_new=False,
+    )
 
 
 @pytest.fixture