WP Cron being triggered but not working as expected

In your code you have:

if ( isset( $_POST["run_import"] ) ) {
    add_action( 'import_execution_event_test', ...

But when wp-cron.php is spawned, there’s probably no POST variable called run_import, so your action is never added, and thus not triggered.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)