logs: use stream.destroy() instead of custom hooks

src/tasks.js

@@ -277,7 +277,7 @@ async function getLogs(task, options) {
 
     const cp = logs.tail([`${paths.TASKS_LOG_DIR}/${task.id}.log`], { lines: options.lines, follow: options.follow });
     const logStream = new logs.LogStream({ format: options.format || 'json', source: task.id });
-    logStream.close = cp.terminate; // closing stream kills the child process
+    logStream.on('close', () => cp.terminate()); // the caller has to call destroy() on logStream. destroy() of Transform emits 'close'
 
     cp.stdout.pipe(logStream);