Make CI + tests more efficient #1930

Job	Run time
test (1, ubuntu-latest, x64, 2, DynamicPPL)	4m 3s
test (1, ubuntu-latest, x64, 2, Doctests)	4m 0s
test (1, ubuntu-latest, x64, 2, Downstream)	4m 2s
test (min, ubuntu-latest, x64, 2, DynamicPPL)	3m 25s
test (min, ubuntu-latest, x64, 2, Doctests)	3m 28s
test (min, ubuntu-latest, x64, 2, Downstream)	3m 34s
test (1, ubuntu-latest, x64, 1, DynamicPPL)	4m 19s
test (1, ubuntu-latest, x64, 1, Doctests)	4m 0s
test (1, ubuntu-latest, x64, 1, Downstream)	4m 5s
test (min, ubuntu-latest, x64, 1, DynamicPPL)	3m 36s
test (min, ubuntu-latest, x64, 1, Doctests)	3m 34s
test (min, ubuntu-latest, x64, 1, Downstream)	3m 31s
test (1, ubuntu-latest, x86, 2, DynamicPPL)	4m 39s
test (1, ubuntu-latest, x86, 2, Doctests)	4m 39s
test (1, ubuntu-latest, x86, 2, Downstream)	4m 43s
test (1, windows-latest, x64, 2, DynamicPPL)	7m 9s
test (1, windows-latest, x64, 2, Doctests)	6m 47s
test (1, windows-latest, x64, 2, Downstream)	6m 37s
test (1, macos-latest, aarch64, 2, DynamicPPL)	2m 40s
test (1, macos-latest, aarch64, 2, Doctests)	3m 14s
test (1, macos-latest, aarch64, 2, Downstream)	2m 52s
	1h 28m 57s

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