e2e test improvements
- defined reset data scripts ... delete all the data in the test DB beloging to the credits coins plugin
    truncate plugin_dev.wp_credits_coins_movements;
    truncate plugin_dev.wp_credits_coins_purchases;
    delete from plugin_dev.wp_options where plugin_dev.wp_options.option_name = 'credits-coins-options';
    delete from plugin_dev.wp_postmeta where plugin_dev.wp_postmeta.meta_key like 'credits-coins-post-value';
    delete from plugin_dev.wp_usermeta where plugin_dev.wp_usermeta.meta_key like 'credits-coins-user-credits';
- test function "show latest 15 credits movements" in the user profile
- add e2e testing to remove default credits values per page, post