Tests for accelerator detection (NVIDIA GPU)

Introduce `$EESSI_SOFTWARE_LAYER_VERSION_SUFFIX` to make build scripts more dynamic #612

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Run time

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Job	Run time
build (cc01, 2023.06)	41s
build (no_devices, 2023.06)	45s
build (1xa100, 2023.06)	29s
build (none, 2023.06)	32s
build (2xa100, 2023.06)	48s
build (4xa100, 2023.06)	1m 2s
	4m 17s