Add ObjectManagedLoader for PHPStan

tests/object-manager.php

@@ -0,0 +1,13 @@
+<?php
+
+/**
+ * Required for PHPStan.
+ *
+ * @see https://github.com/phpstan/phpstan-doctrine#configuration
+ */
+require __DIR__ . '/../vendor/autoload.php';
+
+$kernel = new AppKernel('test', true);
+$kernel->boot();
+
+return $kernel->getContainer()->get('doctrine')->getManager();