feat(genai/embeddings/multimodal): Add multimodal video embedding example

[Kef131]

Description

Fixes #
b/546128007

Add new example for generating multimodal videos embeddings using the Gemini API and corresponding test.

• Added multimodal_embedding_video.py implementing an example of embedding image and text content using the Gemini embedding model (gemini-embedding-2).
• Changed the default GOOGLE_CLOUD_LOCATION for tests from us-central1 to global for broader compatibility.

Checklist

Testing

• I have tested this change on a live environment and verified it works as intended.

Compliance & Style

• I have followed the Sample Guidelines.
• The README is updated with all relevant information (if applicable).
• If this PR adds a new sample directory: I updated the CODEOWNERS file.

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Post-Approval Actions

• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

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• genai/embeddings/multimodal_embedding_video.py:15, tag aiplatform_genai_multimodal_embedding_video

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[gemini-code-assist]

Code Review

This pull request introduces a new example and test for multimodal video embedding using the gemini-embedding-2 model. The feedback highlights that changing the global GOOGLE_CLOUD_LOCATION environment variable to global can break other regional tests like model tuning; it is recommended to revert this change and use monkeypatch to set the location locally for the video embedding test. Additionally, the reviewer suggests constructing the Part object directly with file_data and video_metadata instead of mutating it after creation to ensure robustness and idiomatic code.

[angelcaamal]

LGTM!

[XrossFox]

LGTM