Address "wal-g backup-list" order issue

Use backup-list --detail to have the correct WAL-G backups orders.

Details: https://github.com/wal-g/wal-g/issues/694

In our situation (GCP bucket where backups older than 14d are moved to another type of storage, getting modtime updated), we still have incorrect backup-list order, even for WAL-G 1.1

backup-list --detail shows the correct order – by creation time.

Therefore we either need to use it (--detail option) or reorder the list explicitly as in https://ops.gitlab.net/gitlab-com/gl-infra/gitlab-restore/postgres-gprd/-/blob/master/bootstrap.sh#L191-196