End-to-end test of EasyBuild in different distros

Use `getenv` modulefile command with `EnvironmentModules` >= 4.2.0 #1106

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Run time

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Job	Run time
End-to-end test (centos-8.5)	6m 40s
End-to-end test (fedora-36)	6m 14s
End-to-end test (opensuse-15.4)	5m 48s
End-to-end test (rockylinux-8.8)	6m 31s
End-to-end test (rockylinux-9.2)	6m 45s
End-to-end test (ubuntu-20.04)	8m 22s
End-to-end test (ubuntu-22.04)	8m 16s
	48m 36s