Show trace on UnknownFailure #1970

Job	Run time
Build Echidna on ubuntu-20.04	6m 15s
Build Echidna on macos-13	35m 20s
Build Echidna on windows-latest	30m 11s
Test with solc 0.4.25 on ubuntu-latest	4m 58s
Test with solc 0.5.7 on ubuntu-latest	3m 27s
Test with solc 0.6.12 on ubuntu-latest	3m 17s
Test with solc 0.7.5 on ubuntu-latest	4m 0s
Test with solc 0.4.25 on windows-latest	3m 50s
Test with solc 0.5.7 on windows-latest	4m 12s
Test with solc 0.6.12 on windows-latest	4m 34s
Test with solc 0.7.5 on windows-latest	4m 34s
	1h 44m 38s

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