MC-31920: Let Magento\Framework\Lock\Backend\Database have 2 locks in single connection

- Make DummyLocker primary lock manager instead of DB lock manager for integration tests;

Author: adifucan

dev/tests/integration/etc/di/preferences/ce.php

@@ -27,7 +27,7 @@
     \Magento\Framework\App\Config\ScopeConfigInterface::class => \Magento\TestFramework\App\Config::class,
     \Magento\Framework\App\ResourceConnection\ConfigInterface::class =>
         \Magento\Framework\App\ResourceConnection\Config::class,
-    \Magento\Framework\Lock\Backend\Cache::class =>
+    \Magento\Framework\Lock\Backend\Database::class =>
         \Magento\TestFramework\Lock\Backend\DummyLocker::class,
     \Magento\Framework\Session\SessionStartChecker::class => \Magento\TestFramework\Session\SessionStartChecker::class,
     \Magento\Framework\HTTP\AsyncClientInterface::class => \Magento\TestFramework\HTTP\AsyncClientInterfaceMock::class,