EasyBuild framework unit tests

Copy build log and artifacts to a permanent location after failures #5621

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Run time

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Job	Run time
setup	1s
build (3.6, Lmod-7.8.22)	12m 1s
build (3.6, Lmod-8.7.6)	12m 13s
build (3.6, modules-tcl-1.147)	9m 9s
build (3.6, modules-3.2.10)	8m 22s
build (3.6, modules-4.1.4)	10m 35s
build (3.7, Lmod-8.7.6)	12m 19s
build (3.8, Lmod-8.7.6)	12m 18s
build (3.9, Lmod-8.7.6)	12m 46s
build (3.10, Lmod-8.7.6)	11m 57s
build (3.11, Lmod-8.7.6)	10m 45s
build (3.6, Lmod-8.7.6, C)	12m 5s
	2h 4m 31s