Function collect_output_until_exit 

pub async fn collect_output_until_exit(
    output_rx: Receiver<Vec<u8>>,
    exit_rx: Receiver<i32>,
    timeout_ms: u64,
) -> (Vec<u8>, i32)

Collect output from a process until it exits or times out.

This is useful for tests and simple use cases where you want all output.