minor symfony#61651 [FrameworkBundle] do not parse attributes on abstract classes with DI < 7.4 (xabbuh)

This PR was merged into the 7.4 branch.

Discussion
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[FrameworkBundle] do not parse attributes on abstract classes with DI < 7.4

| Q             | A
| ------------- | ---
| Branch?       | 7.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

see failures on the low deps job: https://github.com/symfony/symfony/actions/runs/17460089102/job/49582532853#step:9:6141

Commits
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13691fc do not parse attributes on abstract classes with DI < 7.4

Author: nicolas-grekas

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php

@@ -60,6 +60,7 @@
 use Symfony\Component\Console\Debug\CliRequest;
 use Symfony\Component\Console\Messenger\RunCommandMessageHandler;
 use Symfony\Component\DependencyInjection\Alias;
+use Symfony\Component\DependencyInjection\Argument\ArgumentTrait;
 use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
 use Symfony\Component\DependencyInjection\Argument\ServiceLocatorArgument;
 use Symfony\Component\DependencyInjection\ChildDefinition;
@@ -1817,7 +1818,7 @@ private function registerValidationConfiguration(array $config, ContainerBuilder
 
         // When attributes are disabled, it means from runtime-discovery only; autoconfiguration should still happen.
         // And when runtime-discovery of attributes is enabled, we can skip compile-time autoconfiguration in debug mode.
-        if (class_exists(ValidatorAttributeMetadataPass::class) && (!($config['enable_attributes'] ?? false) || !$container->getParameter('kernel.debug'))) {
+        if (class_exists(ValidatorAttributeMetadataPass::class) && (!($config['enable_attributes'] ?? false) || !$container->getParameter('kernel.debug')) && trait_exists(ArgumentTrait::class)) {
             // The $reflector argument hints at where the attribute could be used
             $container->registerAttributeForAutoconfiguration(Constraint::class, function (ChildDefinition $definition, Constraint $attribute, \ReflectionClass|\ReflectionMethod|\ReflectionProperty $reflector) {
                 $definition->addTag('validator.attribute_metadata');