EasyBuild framework unit tests

Copy build log and artifacts to a permanent location after failures #5619

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Run time

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Job	Run time
setup	1s
build (3.6, Lmod-7.8.22)	3m 18s
build (3.6, Lmod-8.7.6)	3m 13s
build (3.6, modules-tcl-1.147)	2m 58s
build (3.6, modules-3.2.10)	3m 0s
build (3.6, modules-4.1.4)	2m 59s
build (3.7, Lmod-8.7.6)	1s
build (3.8, Lmod-8.7.6)	1s
build (3.9, Lmod-8.7.6)	1s
build (3.10, Lmod-8.7.6)	3m 27s
build (3.11, Lmod-8.7.6)	3m 32s
build (3.6, Lmod-8.7.6, C)	3m 6s
	25m 37s