Disable metadata creation hack in smarthttp service tests

This commit amends the smarthttp service's tests to not rely on Praefect's metadata force creation hack. The hack creates metadata for repositories when Praefect first sees a request for the repository. This has potential to hide problems in tests and doesn't match the production scenario. To prepare for removing the hack entirely, this commit refactors the tests to create the test repositories through the API rather than placing them directly in the storage.

Some tests had to be adapted as Praefect is returning different error codes that Gitaly in some cases.

Related to: #4019 (closed)