First draft of running linting and unit tests separately. #3971

Job	Run time
Run unit tests in containers (Run unit tests for el9toel10 and common repositories on python 3.12...	54s
Run unit tests in containers (Run python linters for el9toel10 and common repositories on python ...	10s
Run unit tests in containers (Run unit tests for el9toel10 and common repositories on python 3.9,...	47s
Run unit tests in containers (Run python linters for el9toel10 and common repositories on python ...	9s
Run unit tests in containers (Run unit tests for el8toel9 and common repositories on python 3.9, ...	55s
Run unit tests in containers (Run python linters for el8toel9 and common repositories on python 3...	9s
Run unit tests in containers (Run unit tests for el8toel9 and common repositories on python 3.6, ...	1m 4s
Run unit tests in containers (Run python linters for el8toel9 and common repositories on python 3...	3m 10s
Run unit tests in containers (Run unit tests for el7toel8 and common repositories on python 3.6, ...	1m 16s
Run unit tests in containers (Run python linters for el7toel8 and common repositories on python 3...	3m 58s
Run unit tests in containers (Run unit tests for el7toel8 and common repositories on python 2.7, ...	1m 27s
Run unit tests in containers (Run python linters for el7toel8 and common repositories on python 2...	6m 18s
	20m 17s

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