docs(genai): Add Batch Embeddings Sample for Gen AI SDK

[holtskinner]

• Removed extra file from docs(genai): Text Embedding Sample for Gen AI SDK #13172

[snippet-bot]

Here is the summary of changes.

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• genai/batch_prediction/batchpredict_embeddings_with_gcs.py:17, tag googlegenaisdk_batchpredict_embeddings_with_gcs

You are about to delete 1 region tag.

• genai/embeddings/embed_content_text.py:17, tag googlegenaisdk_embeddings_docretrieval_with_txt

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[msampathkumar]

LGTM. Great work!