Debuggable determinism tests

[ZenGround0]

Right now the determinism tests are not particularly easy to debug. This is bad because in the case of rarely triggered determinism bugs we could get into a situation where we know from a CI run that there is a non-deterministic actors message but not be able to isolate which message or even which test it is coming from.

This is not a big problem if we hit the bug locally, we just have to diff the new test-vectors and the test-vectors checked in. But we could make things nicer and have make determinism-check output information on the diffs.

This is problem on CI because the generated test-vector artifacts are not stored anywhere. We should find a way to either store the output for some time / in the case of error, or, probably this is better, add debug output to CI logs.