refactor(async-queue): strengthen Result type handling in Driver and AfterHandle event (#7603)

Author: huangdijia

src/Driver/Driver.php

@@ -120,16 +120,16 @@ protected function getCallback($data, $message): callable
                 $this->event?->dispatch(new BeforeHandle($message));
 
                 $result = $message->job()->handle();
+                $result = $result instanceof Result ? $result : Result::ACK;
 
                 match ($result) {
                     Result::REQUEUE => $this->remove($data) && $this->retry($data),
                     Result::RETRY => $this->remove($data) && $message->attempts() && $this->retry($message),
                     Result::DROP => $this->remove($data),
                     Result::ACK => $this->ack($data),
-                    default => $this->ack($data),
                 };
 
-                $this->event?->dispatch(new AfterHandle($message, $result instanceof Result ? $result : null));
+                $this->event?->dispatch(new AfterHandle($message, $result));
             } catch (Throwable $ex) {
                 if (isset($message, $data)) {
                     if ($message->attempts() && $this->remove($data)) {

src/Event/AfterHandle.php

@@ -17,7 +17,7 @@
 
 class AfterHandle extends Event
 {
-    public function __construct(MessageInterface $message, public ?Result $result = null)
+    public function __construct(MessageInterface $message, public Result $result)
     {
         parent::__construct($message);
     }