use testing database for capturing test data (#10635)

if available

scripts/save-test-data.php

@@ -27,6 +27,8 @@ $options = getopt(
 $init_modules = array('discovery', 'polling');
 require $install_dir . '/includes/init.php';
 
+\config(['database.default' => 'testing']); // use testing db (which falls back to the primary db)
+
 $debug = (isset($options['d']) || isset($options['debug']));
 $vdebug = $debug;