Test installation of EESSI test suite with 'pip install'

General config and `run_reframe.sh` for local and EESSI stack #811

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Run time

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Job	Run time
test_pip_install (3.6)	30s
test_pip_install (3.7)	31s
test_pip_install (3.8)	25s
test_pip_install (3.9)	30s
test_pip_install (3.10)	25s
test_pip_install (3.11)	27s
	2m 48s