[ContentUnderstanding] Align audio content range samples with video scenarios

[Copilot]

Audio content range samples used different scenarios ("5000-", "2000-8000") than the video samples. Updated to use the same 4 canonical patterns across both modalities for consistency with .NET/Java SDK samples.

Changes

• sample_analyze_url.py / sample_analyze_url_async.py — Replaced audio content range examples with:
  • "0-5000" — first 5 seconds
  • "10000-" — from 10 seconds onward
  • "1200-3651" — sub-second precision
  • "0-3000,30000-" — combined time ranges
• test_sample_analyze_url.py — Updated test_sample_analyze_audio_url_with_content_ranges to validate all 4 scenarios with boundary assertions matching the video test structure

# Audio now mirrors video content range patterns:
audio_range_poller = client.begin_analyze(
    analyzer_id="prebuilt-audioSearch",
    inputs=[AnalysisInput(url=audio_url, content_range="0-5000")],
)

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