fix(datastore): use "safe find or create" instead of "create or find" for namespaces

See merge request gitlab-org/container-registry!795

fix(datastore): use "safe find or create" instead of "create or find" for repositories

See merge request gitlab-org/container-registry!796

## [3.14.3](gitlab-org/container-registry@v3.14.2-gitlab...v3.14.3-gitlab) (2021-11-09)

### Bug Fixes

* **datastore:** use "safe find or create" instead of "create or find" for namespaces ([0feff9ed](gitlab-org/container-registry@0feff9ed))
* **datastore:** use "safe find or create" instead of "create or find" for repositories ([7b73cc98](gitlab-org/container-registry@7b73cc98))