chore: skip Gemini tests in local runs

Skip Gemini example tests in local runs to prevent it failing when the
user has gcloud configured but not with the ability to run the Gemini
APIs as that prevents coverage profiles from being run when developing
new features or fixing bugs.

Switch test skip from a print to pytest.skip so that its clear that the
test didn't actually run.

Fixes: #2167

Author: stevenh

docs/graph.md

@@ -352,7 +352,7 @@ stateDiagram-v2
   Feedback --> [*]
 ```
 
-```python {title="genai_email_feedback.py" py="3.10"}
+```python {title="genai_email_feedback.py" py="3.10" test="ci_only"}
 from __future__ import annotations as _annotations
 
 from dataclasses import dataclass, field

docs/models/google.md

@@ -58,7 +58,7 @@ 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
+```python {test="ci_only"}
 from pydantic_ai import Agent
 from pydantic_ai.models.google import GoogleModel
 from pydantic_ai.providers.google import GoogleProvider

tests/test_examples.py

@@ -205,7 +205,9 @@ def print(self, *args: Any, **kwargs: Any) -> None:
             eval_example.lint_ruff(example)
 
     if opt_test.startswith('skip'):
-        print(opt_test[4:].lstrip(' -') or 'running code skipped')
+        pytest.skip(opt_test[4:].lstrip(' -') or 'running code skipped')
+    elif opt_test.startswith('ci_only') and os.environ.get('GITHUB_ACTIONS', '').lower() != 'true':
+        pytest.skip(opt_test[7:].lstrip(' -') or 'running code skipped in local tests')
     else:
         test_globals: dict[str, str] = {'__name__': dunder_name}