CI: Test with a external PostgreSQL/Redis/object storage
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## Summary
In GitLab 19.0 the bundled PostgreSQL, Redis and MinIO will be removed from GitLab chart: https://gitlab.com/gitlab-org/charts/gitlab/-/work_items/6271.
GitLab Operator needs to update it's CI to not fail once the removal happened.
## Acceptance Criteria
- [ ] No review environment depends on bundled PostgreSQL/Redis/MinIO
- [ ] Setup follows pattern established in https://gitlab.com/gitlab-org/charts/gitlab/-/work_items/6271
issue