ARMI unit tests

Add implementation descriptions for energyGroups and macroXSGenerationInterface #4976

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Run time

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Job	Run time
build (3.7)	9m 24s
build (3.8)	8m 34s
build (3.9)	8m 20s
build (3.10)	8m 21s
build (3.11)	7m 10s
	41m 49s