[6.x] Adding a pipes() method (Getter) in Pipeline class

[arcanedev-maroc]

This change allows to do something more dynamic like:

class BackupAction extends Pipeline
{
    protected function pipes(): array
    {
        return config('actions.backup.tasks', [
            Tasks\SetupPassable::class,
            Tasks\CreateTemporaryDirectory::class,
            Tasks\PrepareFilesToBackup::class,
            Tasks\CreateZipBackupFile::class,
            Tasks\MoveZipArchiveToDisks::class,
            Tasks\SendNotification::class,
        ]);
    }
}