fix(google-genai): remove unsupported propertyNames and patternProperties from JSON schema for Gemini tool-calling

[Nitinref]

Fix: Gemini JSON Schema Error (propertyNames removed)

This PR fixes the issue where Gemini throws:

INVALID_ARGUMENT: Unexpected property: propertyNames

What was the bug?

Zod → Gemini schema conversion was passing fields that Gemini does not support:

• propertyNames
• additionalProperties
• strict object metadata

Gemini rejects these and breaks tool calling + structured output.

What we added

A new utility cleanGeminiSchema.ts that:

• Recursively removes unsupported JSON schema fields
• Ensures Gemini gets a clean schema
• Prevents the INVALID_ARGUMENT error

Files changed

• chat_models.ts
• utils/common.ts
• cleanGeminiSchema.ts (new file)

Manual Test (passed)

Running a tool with a Zod schema containing dynamic keys now works without errors.

Summary

This PR ensures that all Gemini models accept LangChain-generated schemas safely and correctly.

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[hntrl]

Could we add some kind of test suite to verify this works?

[Nitinref]

@hntrl Added a focused unit test for the google-genai package
to verify that unsupported propertyNames and
patternProperties are removed from schemas.
The google-genai test suite passes locally.