test-utils: Add fails_with_code() function #6505

Job	Run time
Build the fuzzers	1m 58s
Run the fuzzers (fuzz_test, true)	2m 20s
Run the fuzzers (fuzz_date, false)	1m 54s
Run the fuzzers (fuzz_expr, true)	2m 36s
Run the fuzzers (fuzz_printf, false)	2m 24s
Run the fuzzers (fuzz_echo, true)	2m 38s
Run the fuzzers (fuzz_seq, false)	1m 43s
Run the fuzzers (fuzz_sort, false)	1m 45s
Run the fuzzers (fuzz_wc, false)	1m 35s
Run the fuzzers (fuzz_cut, false)	1m 18s
Run the fuzzers (fuzz_split, false)	1m 33s
Run the fuzzers (fuzz_tr, false)	1m 43s
Run the fuzzers (fuzz_env, false)	1m 20s
Run the fuzzers (fuzz_cksum, false)	1m 32s
Run the fuzzers (fuzz_parse_glob, true)	2m 30s
Run the fuzzers (fuzz_parse_size, true)	1m 17s
Run the fuzzers (fuzz_parse_time, true)	2m 17s
Run the fuzzers (fuzz_seq_parse_number, true)	2m 14s
	34m 37s

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