[TASK] Ensure to set a SchemaManagerFactory for lowlevel connection

The doctrine team deprecated the instantiation of a connection
using `DriverManager::getConnection()` without a configuration
object [1].

This change ensures to set the default doctrine factory, but
sets the TYPO3 core implementation with TYPO3 v13.0 to provide
the custom SchemaManager for the different platforms.

[1] https://github.com/doctrine/dbal/blob/3.7.x/UPGRADE.md#deprecated-not-setting-a-schema-manager-factory

Releases: main

Classes/Core/Testbase.php

@@ -661,7 +661,16 @@ public function setUpTestDatabase(string $databaseName, string $originalDatabase
         // @todo: This should by now work with using "our" ConnectionPool again, it does now, though.
         $connectionParameters = $GLOBALS['TYPO3_CONF_VARS']['DB']['Connections']['Default'];
         unset($connectionParameters['dbname']);
-        $connection = DriverManager::getConnection($connectionParameters);
+        $configuration = (new Configuration())->setSchemaManagerFactory(GeneralUtility::makeInstance(DefaultSchemaManagerFactory::class));
+        // @todo Remove class exist check if supported minimal TYPO3 version is raised to v13+.
+        if (class_exists(\TYPO3\CMS\Core\Database\Schema\SchemaManager\CoreSchemaManagerFactory::class)) {
+            /** @var SchemaManagerFactory|\TYPO3\CMS\Core\Database\Schema\SchemaManager\CoreSchemaManagerFactory $coreSchemaFactory */
+            $coreSchemaFactory = GeneralUtility::makeInstance(
+                \TYPO3\CMS\Core\Database\Schema\SchemaManager\CoreSchemaManagerFactory::class
+            );
+            $configuration->setSchemaManagerFactory($coreSchemaFactory);
+        }
+        $connection = DriverManager::getConnection($connectionParameters, $connection);
         $schemaManager = $connection->createSchemaManager();
         $platform = $connection->getDatabasePlatform();
         $isSQLite = $platform instanceof DoctrineSQLitePlatform;