Enables continuous language ID for Azure STT

[MSameerAbbas]

Configures Azure speech-to-text to use continuous language identification when multiple languages are specified. This ensures language detection dynamically updates throughout the streaming session, improving accuracy and adaptability for multilingual audio streams.

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All committers have signed the CLA.

[MSameerAbbas]

@chenghao-mou @tinalenguyen This PR should close #4449.

[tinalenguyen]

/test-stt

[github-actions]

❌ /test-stt command is only available for organization members.

[chenghao-mou]

/test-stt

[github-actions]

STT Test Results

Status: ✗ Some tests failed

Metric	Count
✓ Passed	23
✗ Failed	0
× Errors	1
→ Skipped	15
▣ Total	39
⏱ Duration	210.2s

Failed Tests

• tests.test_stt::test_stream[livekit.plugins.aws]

  def finalizer() -> None:
          """Yield again, to finalize."""
    
          async def async_finalizer() -> None:
              try:
                  await gen_obj.__anext__()  # type: ignore[union-attr]
              except StopAsyncIteration:
                  pass
              else:
                  msg = "Async generator fixture didn't stop."
                  msg += "Yield only once."
                  raise ValueError(msg)
    
          task = _create_task_in_context(event_loop, async_finalizer(), context)
  >       event_loop.run_until_complete(task)
  
  .venv/lib/python3.12/site-packages/pytest_asyncio/plugin.py:347: 
  _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
  
  self = <_UnixSelectorEventLoop running=False closed=True debug=False>
  future = <Task finished name='Task-117' coro=<_wrap_asyncgen_fixture.<locals>._asyncgen_fixture_wrapper.<locals>.finalizer.<loc... File "/home/runner/work/agents/agents/.venv/lib/python3.12/site-packages/smithy_http/aio/crt.py", line 104, in chunks>
  
      def run_until_complete(self, future):
          """Run until the Future is done.
    
          If the argument is a coroutine, it is wrapped in a Task.
    
          WARNING: It would be disastrous to call run_until_complete()
          with the same coroutine twice -- it would wrap it in two
          different Tasks and that can't be good.
    
          Return the Future's result, or raise its exception.
          """
          self._check_closed()
          self._check_running()
    
          new_task = not futures.isfuture(future)
          future = tasks.ensure_future(future, loop=self)
          if new_task:
              # An exception is raised if the future didn't complete, so there
              # is no need to log the "destroy pending task" message
              future._log_destroy_pending = False
    
          future.add_done_callback(_run_until_complete_cb)
          try:
              self.run_forever()
          except:
              if new_task and future.done() and not future.canc
  

Skipped Tests

Test	Reason
tests.test_stt::test_recognize[livekit.plugins.fireworksai]	unknown@FireworksAI does not support batch recognition
tests.test_stt::test_recognize[livekit.plugins.nvidia]	unknown@unknown does not support batch recognition
tests.test_stt::test_recognize[livekit.plugins.assemblyai]	universal-streaming-english@AssemblyAI does not support batch recognition
tests.test_stt::test_recognize[livekit.plugins.speechmatics]	unknown@Speechmatics does not support batch recognition
tests.test_stt::test_recognize[livekit.plugins.aws]	unknown@Amazon Transcribe does not support batch recognition
tests.test_stt::test_recognize[livekit.plugins.cartesia]	ink-whisper@Cartesia does not support batch recognition
tests.test_stt::test_recognize[livekit.plugins.soniox]	stt-rt-v3@Soniox does not support batch recognition
tests.test_stt::test_recognize[livekit.plugins.deepgram.STTv2]	flux-general-en@Deepgram does not support batch recognition
tests.test_stt::test_recognize[livekit.plugins.gradium.STT]	unknown@Gradium does not support batch recognition
tests.test_stt::test_recognize[livekit.agents.inference]	unknown@livekit does not support batch recognition
tests.test_stt::test_recognize[livekit.plugins.azure]	unknown@Azure STT does not support batch recognition
tests.test_stt::test_stream[livekit.plugins.elevenlabs]	Scribe@ElevenLabs does not support streaming
tests.test_stt::test_stream[livekit.plugins.mistralai]	voxtral-mini-latest@MistralAI does not support streaming
tests.test_stt::test_stream[livekit.plugins.openai]	gpt-4o-mini-transcribe@api.openai.com does not support streaming
tests.test_stt::test_stream[livekit.plugins.fal]	Wizper@Fal does not support streaming

---

Triggered by workflow run #82

[tinalenguyen]

@MSameerAbbas Thanks for the PR!