test_runner: support custom message for expectFailure #3232

Job	Run time
Build slim tarball	1m 16s
x86_64-darwin: with shared libraries	57m 12s
x86_64-linux: with shared libraries	33m 20s
aarch64-linux: with shared libraries	32m 50s
aarch64-darwin: with shared libraries	31m 2s
	2h 35m 40s

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