run_asyncio_service must guarantee that the service has finished before returning

We need to either get rid of `run_asyncio_service()` or fix it so that it cancels the manager and awaits for it to be finished when manager.run() returns

Start by locating the run_asyncio_service entry point and tracing how manager.run() returns. Review the service lifecycle and existing async tests, if present, to determine how completion is observed. Done means the manager has been cancelled and awaited before run_asyncio_service returns, or the entry point is removed as the issue discusses.

Written by the indexing model from the issue text.