ARMI unit tests

Replacing the concrete material with a better reference #5574

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Run time

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Job	Run time
build (3.7)	9m 41s
build (3.8)	9m 23s
build (3.9)	9m 22s
build (3.10)	9m 22s
build (3.11)	4m 10s
	41m 58s