feat(genai): Adding videogen samples

[Guiners]

Description

Fixes #

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• genai/video-generation/videogen-with-img.js:17, tag googlegenaisdk_videogen_with_img
• genai/video-generation/videogen-with-txt.js:17, tag googlegenaisdk_videogen_with_txt

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[gemini-code-assist]

Summary of Changes

Hello @Guiners, 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 expands the generative AI capabilities by adding new samples for video generation. It provides practical examples for developers to leverage the Google GenAI SDK to create videos from either an image or a text description, complete with tests to validate the integration and output.

Highlights

• New Video Generation Samples: Introduced new generative AI samples for creating videos using the Google GenAI SDK.
• Video from Image: Added a sample demonstrating how to generate video content from an input image prompt.
• Video from Text: Included a sample showcasing the generation of video content purely from a text prompt.
• Dedicated Test Files: Created corresponding test files for both the image-to-video and text-to-video generation samples to ensure functionality.

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[gemini-code-assist]

Code Review

This pull request introduces new samples for video generation. The implementation is a good start, but there are several areas for improvement. My review includes feedback on a potential critical bug in the operation polling logic, missing resource cleanup in tests which can lead to resource leaks, and several suggestions to improve code quality and maintainability, such as removing hardcoded values and leftover debug code. I also noticed code duplication in the test files that could be refactored for better reuse.