End-to-end test of EasyBuild in different distros

Small improvements to `ModuleLoadEnvironment` #1828

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Run time

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Job	Run time
End-to-end test (centos-8.5)	6m 39s
End-to-end test (fedora-36)	6m 13s
End-to-end test (opensuse-15.4)	5m 33s
End-to-end test (rockylinux-8.8)	6m 43s
End-to-end test (rockylinux-9.2)	6m 44s
End-to-end test (ubuntu-20.04)	8m 17s
End-to-end test (ubuntu-22.04)	8m 10s
	48m 19s