Don't hardcode IDs in migration spec
What does this MR do?
The spec would fail sporadically without retries, e.g. https://gitlab.com/gitlab-org/gitlab/-/jobs/428114806:
1740 # PG::UniqueViolation:
1741 # ERROR: duplicate key value violates unique constraint "services_pkey"
1742 # DETAIL: Key (id)=(17) already exists.
Edited by Rémy Coutable