refactor: (GenAI) Reorganized Audio Samples (Group C)

[Thoughtseize1]

Description

Created a new folder: /generative_ai/understand_audio

Region_tag	New file
generativeaionvertexai_gemini_audio_summarization	summarization_example.py
generativeaionvertexai_gemini_audio_transcription	transcription_example.py

❗Files to be deleted after approval:

• /generative_ai/gemini_audio.py
• Marked tests in /generative_ai/test_gemini_examples.py -> (test_summarize_audio and test_transcript_audio )

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• 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 sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners 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

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• generative_ai/understand_audio/summarization_example.py:21, tag generativeaionvertexai_gemini_audio_summarization
• generative_ai/understand_audio/transcription_example.py:21, tag generativeaionvertexai_gemini_audio_transcription

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