Guard enable_native_lazy_objects on doctrine-bundle < 2.15

The doctrine.orm.enable_native_lazy_objects config option was only
added in doctrine/doctrine-bundle 2.15, which requires PHP >= 8.1.
On the PHP 8.0 test job, Composer resolves an older doctrine-bundle
that doesn't recognise this key, so the test app's Doctrine schema
creation step failed with:

  Unrecognized option "enable_native_lazy_objects" under
  "doctrine.orm.entity_managers.default".

Move the option into a separate config file that TestKernel only
loads when the installed doctrine-bundle version actually supports
it, detected via Composer\InstalledVersions. This keeps native lazy
objects enabled on PHP 8.4+ with modern doctrine-bundle, without
breaking older doctrine-bundle installs resolved on PHP 8.0/8.1.

Author: benr77

tests/app/TestKernel.php

@@ -51,6 +51,29 @@ public function registerContainerConfiguration(LoaderInterface $loader): void
 
         $loader->load(sprintf('%s/config/config.yml', __DIR__));
         $loader->load(sprintf('%s/config/config.%s.yml', __DIR__, $this->storage));
+
+        // The "doctrine.orm.enable_native_lazy_objects" option was only added in
+        // doctrine/doctrine-bundle 2.15 (which requires PHP >= 8.1). Older
+        // doctrine-bundle versions, resolved by Composer on PHP 8.0, reject this
+        // key as unrecognized, so only set it when the installed bundle supports it.
+        if ('doctrine' === $this->storage && $this->doctrineBundleSupportsNativeLazyObjects()) {
+            $loader->load(sprintf('%s/config/config.doctrine_native_lazy_objects.yml', __DIR__));
+        }
+    }
+
+    private function doctrineBundleSupportsNativeLazyObjects(): bool
+    {
+        if (!class_exists(\Composer\InstalledVersions::class)) {
+            return false;
+        }
+
+        if (!\Composer\InstalledVersions::isInstalled('doctrine/doctrine-bundle')) {
+            return false;
+        }
+
+        $version = \Composer\InstalledVersions::getVersion('doctrine/doctrine-bundle');
+
+        return null !== $version && \version_compare($version, '2.15.0', '>=');
     }
 
     /**

tests/app/config/config.doctrine.yml

@@ -15,7 +15,6 @@ doctrine:
     orm:
         auto_generate_proxy_classes: '%kernel.debug%'
         auto_mapping: false
-        enable_native_lazy_objects: '%task_test.native_lazy_objects%'
     dbal:
         driver: pdo_sqlite
         host: localhost

tests/app/config/config.doctrine_native_lazy_objects.yml

@@ -0,0 +1,3 @@
+doctrine:
+    orm:
+        enable_native_lazy_objects: '%task_test.native_lazy_objects%'