test_runner: support expecting a test-case to fail #1752

Job	Run time
Build slim tarball	1m 19s
x86_64-linux: with shared libraries	28m 41s
aarch64-darwin: with shared libraries	28m 36s
aarch64-linux: with shared libraries	24m 42s
x86_64-darwin: with shared libraries	34m 50s
	1h 58m 8s

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