[VoiceLive] Fix issues: remove unnecessary subscribeOn, fix Disposable leaks, add graceful session close

[xitzhang]

… Disposable leaks, remove phi4 models, add graceful session close

• Remove subscribeOn(Schedulers.boundedElastic()) from parseToSessionUpdate() in VoiceLiveSessionAsyncClient to avoid per-event thread pool scheduling overhead
• Store and dispose Disposable from receiveEvents().subscribe() in all 8 test files to prevent thread leaks
• Remove phi4-mm-realtime and phi4-mini models from test parameter providers (not deployed in test region)
• Remove unnecessary subscribeOn from MicrophoneInputSample and VoiceAssistantSample
• Add session.close() to shutdown hooks in VoiceAssistantSample, FunctionCallingSample, and MCPSample to prevent NumberFormatException on Ctrl+C shutdown
• Update CHANGELOG.md

Description

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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[xitzhang]

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

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[Copilot]

Pull request overview

This PR updates the VoiceLive Java SDK and related tests/samples to reduce Reactor scheduling overhead, address resource leaks, and improve shutdown/cleanup behavior.

Changes:

• Removed unnecessary subscribeOn(Schedulers.boundedElastic()) usage in the session event parsing pipeline and in audio sending within samples.
• Updated live tests to track and dispose Disposable subscriptions, and removed unsupported phi4-* models from test parameters.
• Added more graceful session shutdown behavior in samples and updated the changelog.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 18 comments.

Show a summary per file

File	Description
sdk/voicelive/azure-ai-voicelive/src/main/java/com/azure/ai/voicelive/VoiceLiveSessionAsyncClient.java	Removes per-event subscribeOn from parsing path.
sdk/voicelive/azure-ai-voicelive/src/test/java/com/azure/ai/voicelive/livetests/VoiceLiveVoicePropertiesTests.java	Removes phi4 model; stores Disposable subscription (but cleanup not in finally).
sdk/voicelive/azure-ai-voicelive/src/test/java/com/azure/ai/voicelive/livetests/VoiceLiveAudioTests.java	Removes phi4 models; stores Disposable subscriptions (but cleanup not in finally).
sdk/voicelive/azure-ai-voicelive/src/test/java/com/azure/ai/voicelive/livetests/VoiceLiveAudioFormatTests.java	Removes phi4 models; adds Disposable; re-enables a test (removes @Disabled).
sdk/voicelive/azure-ai-voicelive/src/test/java/com/azure/ai/voicelive/livetests/VoiceLiveConversationTests.java	Stores Disposable subscriptions (but cleanup not in finally).
sdk/voicelive/azure-ai-voicelive/src/test/java/com/azure/ai/voicelive/livetests/VoiceLiveTranscriptionTests.java	Stores Disposable subscriptions (but cleanup not in finally).
sdk/voicelive/azure-ai-voicelive/src/test/java/com/azure/ai/voicelive/livetests/VoiceLiveTurnDetectionTests.java	Disposes subscriptions in finally.
sdk/voicelive/azure-ai-voicelive/src/test/java/com/azure/ai/voicelive/livetests/VoiceLiveToolCallTests.java	Disposes subscriptions in finally.
sdk/voicelive/azure-ai-voicelive/src/test/java/com/azure/ai/voicelive/livetests/VoiceLiveSessionTests.java	Disposes subscriptions in finally.
sdk/voicelive/azure-ai-voicelive/src/samples/java/com/azure/ai/voicelive/VoiceAssistantSample.java	Removes subscribeOn and adds shutdown/cleanup session close.
sdk/voicelive/azure-ai-voicelive/src/samples/java/com/azure/ai/voicelive/MicrophoneInputSample.java	Removes subscribeOn on audio send.
sdk/voicelive/azure-ai-voicelive/src/samples/java/com/azure/ai/voicelive/MCPSample.java	Adds session close on shutdown and on termination.
sdk/voicelive/azure-ai-voicelive/src/samples/java/com/azure/ai/voicelive/FunctionCallingSample.java	Adds session close on shutdown and on termination.
sdk/voicelive/azure-ai-voicelive/CHANGELOG.md	Notes removal of unnecessary subscribeOn in event parsing pipeline.

[xitzhang]

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

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[xitzhang]

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

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