Prevent/remove duplicate tests in SQUAD

Issue Background

When a build and test pipeline in SQUAD is re-triggered, it reports the test results to SQUAD generating duplicate entries for tests on the same build.

Issue description

Duplicate test results cloud the overall test result for a given build. It would be nice, if we could prevent this or delete duplicate results.

Acceptance criteria

• Come up with a way to delete duplicate results or ...
• find out a way to have SQUAD overwrite old test results with newer ones (eliminating the need to remove old test results)