Fix TTS with Proper Error Handling

[toubatbrian]

TTS is throwing Error in SynthesizeStream during interruption.

This PR fix error handling by

1. Avoid sending event to a closed web socket.
2. Suppress false positive errors throwing from expected shutdown logics due to session close / interruption / agent handoffs

[changeset-bot]

🦋 Changeset detected

Latest commit: 2ed3bcc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 14 packages

Name	Type
@livekit/agents	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-bey	Patch
@livekit/agents-plugin-cartesia	Patch
@livekit/agents-plugin-deepgram	Patch
@livekit/agents-plugin-elevenlabs	Patch
@livekit/agents-plugin-google	Patch
@livekit/agents-plugin-livekit	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-resemble	Patch
@livekit/agents-plugin-rime	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugins-test	Patch

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