Build

tests: remove flash validation error failure condition #174

Job	Run time
build-linux-base	25s
build-and-run-linux-sample (hello-world, powered by Ocre, generic/hello-world)	1m 18s
build-and-run-zephyr-sample (filesystem-full, Directory listing for, generic/filesystem-full)	5m 12s
build-and-run-zephyr-sample (hello-world, powered by Ocre, generic/hello-world)	4m 59s
build-and-run-linux-sample (filesystem-full, Directory listing for, generic/filesystem-full)	1m 15s
build-zephyr-base (native_sim)	3m 11s
build-zephyr-base (b_u585i_iot02a)	3m 47s
run-linux-base	26s
flash-zephyr-base-b_u585i_iot02a	10s
run-zephyr-base-native-sim	39s
flash-validation-tests	30s
	21m 52s

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