[VoiceLive]Replace deprecated gpt-4o-realtime-preview with gpt-realtime in live tests

[xitzhang]

Description

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Testing Guidelines

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[xitzhang]

/azp run
java - azure-ai-voicelive - tests

[azure-pipelines]

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[Copilot]

Pull request overview

Updates the VoiceLive live test suite to stop using the deprecated gpt-4o-realtime-preview model name and instead target gpt-realtime, keeping the tests aligned with the current service model identifiers.

Changes:

• Updated model name parameterizations in live tests from gpt-4o-realtime-preview/gpt-4o-realtime to gpt-realtime.
• Adjusted the speech recognition model selection logic to treat gpt-realtime* models as using whisper-1.

[xitzhang]

/azp run java - azure-ai-voicelive - tests

[azure-pipelines]

No pipelines are associated with this pull request.