Test installation of EESSI test suite with 'pip install'

Run local stack of Hortense using `shed_access_in_submit` #828

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Run time

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Job	Run time
test_pip_install (3.6)	32s
test_pip_install (3.7)	27s
test_pip_install (3.8)	30s
test_pip_install (3.9)	32s
test_pip_install (3.10)	25s
test_pip_install (3.11)	29s
	2m 55s