test_runner: support custom message for expectFailure #2996

Job	Run time
Build slim tarball	1m 31s
aarch64-darwin: with shared libraries	2h 3m 14s
aarch64-linux: with shared libraries	1h 28m 28s
x86_64-darwin: with shared libraries	53m 58s
x86_64-linux: with shared libraries	1h 53m 16s
	6h 20m 27s

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