Imagen model update

[lethargicpanda]

Update the imagen-generate models as the -preview-06-06 model is going away.

I am also downgrading the imagen-4.0-ultra-generate-001 in the imagen editing sample to imagen-4.0-generate-001 since the sample doesn't benefit from the specs of ultra.

[gemini-code-assist]

Summary of Changes

Hello @lethargicpanda, 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 primarily focuses on maintaining the currency and efficiency of the Imagen model usage within various samples. It addresses the deprecation of a preview model by migrating to a stable version and optimizes one sample by selecting a less resource-intensive model where the advanced capabilities are not needed. Additionally, a minor documentation update improves clarity.

Highlights

• Imagen Model Update: The imagen-generate models have been updated across several samples, specifically replacing the deprecated imagen-4.0-generate-preview-06-06 with the stable imagen-4.0-generate-001.
• Model Downgrade for Optimization: The imagen-4.0-ultra-generate-001 model in the imagen-editing sample has been downgraded to imagen-4.0-generate-001 as the sample does not require the 'ultra' capabilities, optimizing resource usage.
• Documentation Clarification: The magic-selfie sample's README.md has been updated to refer to 'Imagen model' instead of 'Imagen API' for better clarity.

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[gemini-code-assist]

Code Review

This pull request updates the Imagen model names used across several samples. The changes are necessary to replace a deprecated preview model and to downgrade another for better resource utilization, as explained in the description. The modifications are correct and well-justified. I have provided a couple of suggestions to improve code maintainability by extracting hardcoded model names into constants, which is a good practice and consistent with other parts of the codebase.

[ksemenova]

lgtm