Test installation of EESSI test suite with 'pip install'

Changed Vega formatting config for performance logging to be compatible with ReFrame 4.X #107

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Run time

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Job	Run time
test_pip_install (3.6)	12s
test_pip_install (3.7)	20s
test_pip_install (3.8)	18s
test_pip_install (3.9)	16s
test_pip_install (3.10)	14s
test_pip_install (3.11)	16s
	1m 36s