feat: update veo3 model version

[katiemn]

Description

Update Veo 3 model version

[gemini-code-assist]

Summary of Changes

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This pull request updates the model versions used in the veo3_video_generation.ipynb notebook. The primary video generation models are upgraded to their latest 001 iterations, while a dedicated variable is introduced to retain and explicitly use the previous preview model for image-based video generation, ensuring compatibility and specific model usage where required.

Highlights

• Model Version Update: Updated the video_model and video_model_fast variables within the veo3_video_generation.ipynb notebook to reference the newer veo-3.0-generate-001 and veo-3.0-fast-generate-001 model versions, respectively.
• Model Alias Introduction: Introduced a new variable, image_video_model, specifically assigned to the veo-3.0-generate-preview model. This allows for explicit referencing of the 'preview' model, which was previously the default video_model.
• Usage Adaptation: Modified the client.models.generate_videos call to now use the newly introduced image_video_model when generating videos from an image, ensuring that this specific operation continues to utilize the 'preview' model version.

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[gemini-code-assist]

Code Review

This pull request updates the Veo 3 model versions in the video generation notebook. The changes correctly separate the models for text-to-video and image-to-video generation. I've added a couple of suggestions to improve the variable names for better code clarity and maintainability.