End-to-end test of EasyBuild in different distros

Allow templates in `custom_paths` & `custom_commands` sanity-check arguments #1426

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Run time

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Job	Run time
End-to-end test (centos-7.9)	4m 41s
End-to-end test (centos-8.5)	5m 1s
End-to-end test (fedora-36)	5m 13s
End-to-end test (opensuse-15.4)	4m 25s
End-to-end test (rockylinux-8.8)	4m 55s
End-to-end test (rockylinux-9.2)	5m 10s
End-to-end test (ubuntu-20.04)	5m 12s
End-to-end test (ubuntu-22.04)	4m 59s
	39m 36s