Don't use "failed" in the normal RUS loop logs

[tcNickolas]

https://github.com/microsoft/Quantum/blob/main/samples/diagnostics/unit-testing/RepeatUntilSuccessCircuits.qs uses the word "failed" in the context that doesn't actually indicate a test failure, merely a normal life stage of a RUS loop. This makes test logs harder to navigate when looking for a failing test (I noticed these logs when I was looking for another issue). Would it make sense to rephrase this message to something like "We failed. Outcomes of measuring first and second auxiliary qubits ..." -> "Undesired outcomes of measuring first and second auxiliary qubits ..."?