minor #26909 [Messenger][DX] Uses the adapter name instead of the service name (sroze)

This PR was squashed before being merged into the 4.1-dev branch (closes #26909).

Discussion
----------

[Messenger][DX] Uses the adapter name instead of the service name

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ø
| License       | MIT
| Doc PR        | ø

As a developer, I don't get why I would need to use the service name while I give a name to the adapters. This is basically what this PR means for me in terms of configuration:
```patch
framework:
    messenger:
        routing:
            # We want the command below to be handled async with the "messenger.default_sender" (AMQP producer).
-            'App\Message\Command\CreateNumber': messenger.sender.amqp
+            'App\Message\Command\CreateNumber': amqp

        adapters:
            amqp: "%env(AMQP_DSN)%"
```

And in terms of pulling the messages:
```patch
- bin/console messenger:consume-messages messenger.receiver.amqp
+ bin/console messenger:consume-messages amqp
```

Commits
-------

b5afb40441 [Messenger][DX] Uses the adapter name instead of the service name

Author: fabpot

DependencyInjection/MessengerPass.php

@@ -60,6 +60,7 @@ public function process(ContainerBuilder $container)
         }
 
         $this->registerReceivers($container);
+        $this->registerSenders($container);
         $this->registerHandlers($container);
     }
 
@@ -156,10 +157,26 @@ private function registerReceivers(ContainerBuilder $container)
         $receiverMapping = array();
         foreach ($container->findTaggedServiceIds('messenger.receiver') as $id => $tags) {
             foreach ($tags as $tag) {
-                $receiverMapping[$tag['id'] ?? $id] = new Reference($id);
+                $receiverMapping[$tag['name'] ?? $id] = new Reference($id);
             }
         }
 
         $container->getDefinition('messenger.receiver_locator')->replaceArgument(0, $receiverMapping);
     }
+
+    private function registerSenders(ContainerBuilder $container)
+    {
+        $senderLocatorMapping = array();
+        foreach ($container->findTaggedServiceIds('messenger.sender') as $id => $tags) {
+            foreach ($tags as $tag) {
+                $senderLocatorMapping[$id] = new Reference($id);
+
+                if ($tag['name']) {
+                    $senderLocatorMapping[$tag['name']] = new Reference($id);
+                }
+            }
+        }
+
+        $container->getDefinition('messenger.sender_locator')->replaceArgument(0, $senderLocatorMapping);
+    }
 }

Tests/DependencyInjection/MessengerPassTest.php

@@ -16,6 +16,8 @@
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\ServiceLocator;
+use Symfony\Component\Messenger\Adapter\AmqpExt\AmqpReceiver;
+use Symfony\Component\Messenger\Adapter\AmqpExt\AmqpSender;
 use Symfony\Component\Messenger\ContainerHandlerLocator;
 use Symfony\Component\Messenger\DependencyInjection\MessengerPass;
 use Symfony\Component\Messenger\Handler\ChainHandler;
@@ -90,6 +92,26 @@ public function testGetClassesFromTheHandlerSubscriberInterface()
         $this->assertEquals(array(new Reference(PrioritizedHandler::class), new Reference(HandlerWithMultipleMessages::class)), $definition->getArgument(0));
     }
 
+    public function testItRegistersReceivers()
+    {
+        $container = $this->getContainerBuilder();
+        $container->register(AmqpReceiver::class, AmqpReceiver::class)->addTag('messenger.receiver', array('name' => 'amqp'));
+
+        (new MessengerPass())->process($container);
+
+        $this->assertEquals(array('amqp' => new Reference(AmqpReceiver::class)), $container->getDefinition('messenger.receiver_locator')->getArgument(0));
+    }
+
+    public function testItRegistersSenders()
+    {
+        $container = $this->getContainerBuilder();
+        $container->register(AmqpSender::class, AmqpSender::class)->addTag('messenger.sender', array('name' => 'amqp'));
+
+        (new MessengerPass())->process($container);
+
+        $this->assertEquals(array('amqp' => new Reference(AmqpSender::class), AmqpSender::class => new Reference(AmqpSender::class)), $container->getDefinition('messenger.sender_locator')->getArgument(0));
+    }
+
     /**
      * @expectedException \Symfony\Component\DependencyInjection\Exception\RuntimeException
      * @expectedExceptionMessage Invalid handler service "Symfony\Component\Messenger\Tests\DependencyInjection\UndefinedMessageHandler": message class "Symfony\Component\Messenger\Tests\DependencyInjection\UndefinedMessage" used as argument type in method "Symfony\Component\Messenger\Tests\DependencyInjection\UndefinedMessageHandler::__invoke()" does not exist.
@@ -201,6 +223,11 @@ private function getContainerBuilder(): ContainerBuilder
         $container->setParameter('kernel.debug', true);
         $container->register('message_bus', ContainerHandlerLocator::class);
 
+        $container
+            ->register('messenger.sender_locator', ServiceLocator::class)
+            ->addArgument(new Reference('service_container'))
+        ;
+
         $container
             ->register('messenger.handler_resolver', ContainerHandlerLocator::class)
             ->addArgument(new Reference('service_container'))