test_runner: support expecting a test-case to fail #1735

Job	Run time
Build slim tarball	1m 31s
x86_64-darwin: with shared libraries	40m 8s
aarch64-linux: with shared libraries	25m 19s
aarch64-darwin: with shared libraries	26m 34s
x86_64-linux: with shared libraries	32m 59s
	2h 6m 31s

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