fix: make @babel/node spawned process bubble msg (#13037)

* Add ipc test

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>

packages/babel-node/src/babel-node.js

@@ -96,6 +96,7 @@ getV8Flags(async function (err, v8Flags) {
         }
       });
     });
+    proc.on("message", message => process.send && process.send(message));
     process.on("SIGINT", () => proc.kill("SIGINT"));
   }
 });