chore: skip Gemini tests in local runs

[stevenh]

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

[hyperlint-ai]

PR Change Summary

Updated testing procedures to improve local development experience by skipping certain tests and clarifying test execution status.

• Skipped Gemini example tests in local runs to enhance development workflow.
• Changed test skipping method from print to pytest.skip for better clarity.
• Modified documentation to indicate tests are for CI only.

Modified Files

• docs/graph.md
• docs/models/google.md

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