test_runner: support custom message for expectFailure #3348

Job	Run time
Build slim tarball	2m 22s
aarch64-linux: with shared libraries	46m 7s
x86_64-linux: with shared libraries	1h 6m 52s
aarch64-darwin: with shared libraries	1h 28m 3s
x86_64-darwin: with shared libraries	1h 44m 58s
	5h 8m 22s

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