More reliable plugin runtime kill

crates/yaak-plugins/src/nodejs.rs

@@ -4,6 +4,7 @@ use std::net::SocketAddr;
 use std::path::Path;
 use std::process::Stdio;
 use tokio::io::{AsyncBufReadExt, BufReader};
+use tokio::sync::oneshot;
 use tokio::sync::watch::Receiver;
 use yaak_common::command::new_xplatform_command;
 
@@ -19,6 +20,7 @@ pub async fn start_nodejs_plugin_runtime(
     plugin_runtime_main: &Path,
     addr: SocketAddr,
     kill_rx: &Receiver<bool>,
+    killed_tx: oneshot::Sender<()>,
 ) -> Result<()> {
     // HACK: Remove UNC prefix for Windows paths to pass to sidecar
     let plugin_runtime_main_str =
@@ -72,6 +74,7 @@ pub async fn start_nodejs_plugin_runtime(
             warn!("Failed to kill plugin runtime: {e}");
         }
         info!("Killed plugin runtime");
+        let _ = killed_tx.send(());
     });
 
     Ok(())