[Bug]: pushnotification is not support order-preserving of update event

[zoujie-ee]

What happened?

when status update or artifact update is sent through push notification, the request agent may not receivee those event in the order it produce. here is the code:

at MainEventBusProcessor.java line 337-357,the notification is sent asynchronous, regardless of whether the sending succeeds or fails. it may cause the wrong order of the event queue.
private void sendPushNotification(String taskId, StreamingEventKind event) {
Runnable pushTask = () -> {
try {
if (event != null) {
LOGGER.debug("Sending push notification for task {}", taskId);
pushSender.sendNotification(event);
} else {
LOGGER.debug("Skipping push notification - event is null for task {}", taskId);
}
} catch (Exception e) {
LOGGER.error("Error sending push notification for task {}", taskId, e);
// Don't rethrow - push notifications are best-effort
}
};

    // Use custom executor if set (for tests), otherwise use default ForkJoinPool (async)
    if (pushNotificationExecutor != null) {
        pushNotificationExecutor.execute(pushTask);
    } else {
        CompletableFuture.runAsync(pushTask);
    }
}

Relevant log output

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[perhaps468]

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