Reenable vertexai docs test (#2709)

Author: dmontagu

docs/models/google.md

@@ -61,7 +61,7 @@ To use Vertex AI, you may need to set up [application default credentials](https
 
 If you have the [`gcloud` CLI](https://cloud.google.com/sdk/gcloud) installed and configured, you can use:
 
-```python {test="skip"}
+```python {test="ci_only"}
 from pydantic_ai import Agent
 from pydantic_ai.models.google import GoogleModel
 from pydantic_ai.providers.google import GoogleProvider

tests/conftest.py

@@ -423,7 +423,7 @@ def vertex_provider_auth(mocker: MockerFixture) -> None:  # pragma: lax no cover
     try:
         from google.genai import _api_client
     except ImportError:
-        pytest.skip('google is not installed')
+        return  # do nothing if this isn't installed
 
     @dataclass
     class NoOpCredentials:

tests/test_examples.py

@@ -113,6 +113,7 @@ def test_docs_examples(  # noqa: C901
     allow_model_requests: None,
     env: TestEnv,
     tmp_path_cwd: Path,
+    vertex_provider_auth: None,
 ):
     mocker.patch('pydantic_ai.agent.models.infer_model', side_effect=mock_infer_model)
     mocker.patch('pydantic_ai._utils.group_by_temporal', side_effect=mock_group_by_temporal)