Test logs are not being published in internal VSTS builds

[pakrym]

It worked in https://dev.azure.com/dnceng/internal/_build/results?buildId=88141&view=results
Stopped working in https://dev.azure.com/dnceng/internal/_build/results?buildId=88219&view=results

[Eilon]

Those 2 builds are since deleted.

But the work item here is to make sure that test log output (e.g. tests deriving from LoggedTest) even during successful test runs needs to be saved to the artifacts folder.