fix(symfony): autoconfigure legacy alias fixes #6177 (#6181)

Author: soyuka

src/Symfony/Bundle/DependencyInjection/ApiPlatformExtension.php

@@ -13,6 +13,7 @@
 
 namespace ApiPlatform\Symfony\Bundle\DependencyInjection;
 
+use ApiPlatform\Api\FilterInterface as LegacyFilterInterface;
 use ApiPlatform\Doctrine\Odm\Extension\AggregationCollectionExtensionInterface;
 use ApiPlatform\Doctrine\Odm\Extension\AggregationItemExtensionInterface;
 use ApiPlatform\Doctrine\Odm\Filter\AbstractFilter as DoctrineMongoDbOdmAbstractFilter;
@@ -168,6 +169,8 @@ public function load(array $configs, ContainerBuilder $container): void
 
         $container->registerForAutoconfiguration(FilterInterface::class)
             ->addTag('api_platform.filter');
+        $container->registerForAutoconfiguration(LegacyFilterInterface::class)
+            ->addTag('api_platform.filter');
         $container->registerForAutoconfiguration(ProviderInterface::class)
             ->addTag('api_platform.state_provider');
         $container->registerForAutoconfiguration(ProcessorInterface::class)