[Console] Prevent PHP 8.1 str_replace deprec on null

Prevents:

> Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated

on `getDefaultName()` returning `null`

Author: ogizanagi

src/Symfony/Component/Console/DependencyInjection/AddConsoleCommandPass.php

@@ -67,7 +67,7 @@ public function process(ContainerBuilder $container)
                 if (!$r->isSubclassOf(Command::class)) {
                     throw new InvalidArgumentException(sprintf('The service "%s" tagged "%s" must be a subclass of "%s".', $id, $this->commandTag, Command::class));
                 }
-                $aliases = str_replace('%', '%%', $class::getDefaultName());
+                $aliases = str_replace('%', '%%', $class::getDefaultName() ?? '');
             }
 
             $aliases = explode('|', $aliases ?? '');