fix(azure): Handle STT timeout errors with retries

[aryanjsingh]

Summary

This pull request fixes an issue where the Azure STT plugin would hang indefinitely upon receiving a service timeout error. The _on_canceled callback now identifies timeout errors and triggers a reconnect. The SpeechStream's main loop has been updated to implement a retry mechanism with exponential backoff, ensuring the stream can recover from transient network issues or fail gracefully after exhausting retries.

Changes

• livekit-plugins/livekit-plugins-azure/livekit/plugins/azure/stt.py: The SpeechStream class in the Azure STT plugin has been updated to properly handle ServiceTimeout errors. A retry mechanism with exponential backoff is now implemented in the _run method, which is triggered by the _on_canceled callback when a timeout is detected. This prevents the stream from hanging and allows it to recover from transient network issues or fail gracefully after exhausting all retry attempts.

Related Issue

Closes #5322

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[devin-ai-integration]

Devin Review found 2 potential issues.

View 4 additional findings in Devin Review.