[3.x] Add comment to config file explaining --force with seeding in production (#1326)

* add comment in seed config for clarification

* test tenant creation seeding also in production environments (with force)

* revert changes in DatabasePreparationTest

Author: laundy

assets/config.php

@@ -194,6 +194,6 @@
      */
     'seeder_parameters' => [
         '--class' => 'DatabaseSeeder', // root seeder class
-        // '--force' => true,
+        // '--force' => true, // This needs to be true to seed tenant databases in production
     ],
 ];