Important

Set tool mode to Any for Gemini requests with auto mode and allowed tools to prevent errors.

• Behavior:
  • In gcp_vertex_gemini/mod.rs and google_ai_studio_gemini.rs, set mode to Any if allowed_function_names is set in ToolChoice::Auto to prevent errors.
  • Update tests in gcp_vertex_gemini.rs and google_ai_studio_gemini.rs to verify Any mode is used when allowed_tools is specified with auto.
• Tests:
  • Add test_gcp_vertex_gemini_tool_choice_auto_with_allowed_tools in gcp_vertex_gemini.rs to verify tool call behavior.
  • Add test_google_ai_studio_gemini_tool_choice_auto_with_allowed_tools in google_ai_studio_gemini.rs to ensure correct tool call behavior.
• Misc:
  • Update comments in tests to reflect new behavior.

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