Gemini 3 Pro Preview Support

Added Gemini 3 Pro Preview to supported Task Master AI providers for both Google and Gemini CLI.

Minor Changes

#1427 122c23a Thanks @Crunchyman-ralph! - Added Gemini 3 pro preview to supported Taskmaster AI providers
- Added to Google providers
- Added to Gemini CLI providers
  - Attention: Gemini 3 Pro is available for:
    - Google AI Ultra Subscribers
    - Users who have access via a paid Gemini API key
      - If you want to use the gemini api key, make sure you have this defined in your .env or mcp.json env variables: GEMINI_API_KEY=xxxx

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