This also changes to expectations of the test script. It does not rely on fixed thread IDs anymore, because boards with CDC ACM as stdio have a different first thread then boards with "normal" stdio via UART. This resolves issue #14256
This also changes to expectations of the test script. It does not rely on fixed thread IDs anymore, because boards with CDC ACM as stdio have a different first thread then boards with "normal" stdio via UART. This resolves issue #14256