Bug: TestStatusHistory not shown for independent tests

[MarceloRobert]

Problem: When tests are not related to an existing build (or are related to a build but the build is not related to an existing checkout) - here called as an "independent test" - they don't have a direct way to check for its origin, and the test status history doesn't load.

Expected behaviour: the test status history should load even if it doesn't have an origin

Example: test details page

Possible solution: change the test status history endpoint to allow for a None origin and don't join for origins when performing the query