Add option to install "plain OMNI" to install script and upgrade Github actions runners #1854

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Run time

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Job	Run time
pytest (linux python-3.8)	2m 38s
pytest (linux python-3.9)	2m 25s
pytest (linux python-3.10)	1m 53s
pytest (linux python-3.11)	2m 4s
pytest (macos python-3.11)	14m 58s
	23m 58s