fix: remove $schema and additionalProperties recursively in to_google_format

[jfpedroza]

Description

ReqLLM.to_google_format/1 was only removing additionalProperties at the top level, but Google doesn't accept it at any level. $schema is also not accepted. Both are generated by Zoi.

Example of the error:

Provider response error (400): Google API error:
Invalid JSON payload received. Unknown name \"$schema\" at 'tools[0].function_declarations[2].parameters': Cannot find field.
Invalid JSON payload received. Unknown name \"additionalProperties\" at 'tools[0].function_declarations[2].parameters.properties[1].value.items': Cannot find field.

Type of Change

• Bug fix (non-breaking change fixing an issue)
• New feature (non-breaking change adding functionality)
• Breaking change (fix or feature causing existing functionality to change)
• Documentation update

Breaking Changes

Testing

• Tests pass (mix test)
• Quality checks pass (mix quality)

Checklist

• My code follows the project's style guidelines
• I have updated the documentation accordingly
• I have added tests that prove my fix/feature works
• All new and existing tests pass
• My commits follow conventional commit format
• I have NOT edited CHANGELOG.md (it is auto-generated by git_ops)

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