Add cell scope with sharding key
What does this MR do and why?
Add cell scope with sharding key for following tables: namespace_root_storage_statistics.yml and namespace_statistics.yml
Both of these tables have namespace_id column, which are not null.
More info:
- https://gitlab.com/gitlab-org/gitlab/-/work_items/441640
- https://gitlab.com/gitlab-org/gitlab/-/work_items/441641
Related to #441399
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.