feat(BackupNotification): include database name in BackupFailed notification for better context

app/Console/Commands/Emails.php

@@ -167,7 +167,7 @@ class Emails extends Command
                     ]);
                 }
                 $output = 'Because of an error, the backup of the database '.$db->name.' failed.';
-                $this->mail = (new BackupFailed($backup, $db, $output))->toMail();
+                $this->mail = (new BackupFailed($backup, $db, $output, $backup->database_name ?? 'unknown'))->toMail();
                 $this->sendEmail();
                 break;
             case 'backup-success':