Remove DB isolation from test with reindex

Otherwise we get this error:

User Error: DDL statements are not allowed in transactions in /var/www/magento/vendor/magento/framework/DB/Adapter/Pdo/Mysql.php:504.

Author: schmengler

main/test/integration/Indexer/ProductCollectionFactoryTest.php

@@ -30,7 +30,6 @@ protected function setUp()
 
     /**
      * @magentoAppIsolation enabled
-     * @magentoDbIsolation enabled
      * @magentoAppArea frontend
      * @magentoConfigFixture current_store catalog/frontend/flat_catalog_product 1
      */