Removed async_grpc

[I8dNLo]

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[joein]

qdrant remote now contain an unused import get_async_channel, if we remove it - the generator breaks, we need to remove it and update the generator

[joein]

asyncio and all the related code should be removed from QdrantRemote

if hasattr(self, "_aio_grpc_channel") and self._aio_grpc_channel is not None:
    try:
        loop = asyncio.get_running_loop()
        loop.create_task(self._aio_grpc_channel.close(grace=grpc_grace))
    except AttributeError:
        logging.warning(
            "Unable to close aio_grpc_channel. Connection was interrupted on the server side"
        )
    except RuntimeError:
        pass

this code should be removed as well, the generator should be updated to take this removals into account