Fix gitlab:db:decomposition:migrate task

See merge request !154198



Merged-by: Prabakaran Murugesan <pmurugesan@gitlab.com>
Approved-by: Matt Kasa <mkasa@gitlab.com>
Approved-by: Prabakaran Murugesan <pmurugesan@gitlab.com>
Co-authored-by: Krasimir Angelov <kangelov@gitlab.com>