Please describe the changes in your PR. If it is addressing an issue, please reference that as well.

Main changes are:

1. Replace await task.queue_frames([LLMMessagesFrame(messages)]) with await task.queue_frames([context_aggregator.user().get_context_frame()]).
2. Add

@transport.event_handler("on_participant_left")
        async def on_participant_left(transport, participant, reason):
            await task.queue_frame(EndFrame())

to all 07 interrupted examples (and a select number of others where it was needed)
3. Update PipelineParams in 07 interrupted examples to match:

PipelineParams(
                allow_interruptions=True,
                enable_metrics=True,
                enable_usage_metrics=True,
                report_only_initial_ttfb=True,
            ),

4. Add copyright headers
5. Replace LLMAssistantResponseAggregator and LLMUserResponseAggregator with OpenAILLMContext