chore(config) Update available imagen models in AI example

[DellaBitta]

The current model configured in AVAILABLE_IMAGEN_MODELS is no longer aviailble. Update the list to include our currently supported models.

[gemini-code-assist]

Summary of Changes

Hello @DellaBitta, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the configuration for available Imagen models within the AI example application. The change ensures that the application utilizes currently supported models, as the previously configured model is no longer available, thereby maintaining the functionality and relevance of the AI example.

Highlights

• Model Availability Update: The AVAILABLE_IMAGEN_MODELS constant has been updated to reflect the latest supported Imagen models, replacing a deprecated model.
• New Imagen Models: The list now includes imagen-4.0-generate-001, imagen-4.0-fast-generate-001, and imagen-4.0-ultra-generate-001.

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[gemini-code-assist]

Code Review

This pull request updates the list of available Imagen models. The change is straightforward and aligns with the goal of using currently supported models. I have one suggestion to format the new array to be consistent with the existing code style in the file, which will improve readability and maintainability.