ensure PlacedOrderMessage is re-enqueued when an error occurs

- set retry_strategy so the message is re-enqueued 5 times - after 1, 5, 25, 125, and 625 minutes
- see https://symfony.com/doc/current/messenger.html#retries-failures

app/config/packages/messenger.yaml

@@ -24,6 +24,10 @@ framework:
                         type: direct
                     queues:
                         placed_orders: ~
+                retry_strategy:
+                    max_retries: 5
+                    delay: 60000
+                    multiplier: 5
 
         routing:
             Shopsys\FrameworkBundle\Component\Messenger\ExampleMessage: example_transport