Tests

add Preferences.jl-based configuration #1120

Job	Run time
Julia (1, windows-latest, @CondaPkg)	5m 40s
Julia (1.10, ubuntu-latest, @CondaPkg)	2m 44s
Python (3, ubuntu-latest, @JuliaPkg)	1m 35s
Julia (1, ubuntu-latest, @CondaPkg)	3m 37s
Julia (1, ubuntu-latest, python)	3m 37s
Python (3, macos-latest, @JuliaPkg)	1m 41s
Python (3, windows-latest, @JuliaPkg)	2m 15s
Python (3.10, ubuntu-latest, @JuliaPkg)	1m 36s
Julia (1.10, macos-latest, @CondaPkg)	8m 6s
Python (3.10, macos-latest, @JuliaPkg)	2m 22s
Julia (1, macos-latest, @CondaPkg)	7m 9s
Julia (1.10, windows-latest, @CondaPkg)	6m 12s
Python (3.10, windows-latest, @JuliaPkg)	2m 21s
Python (3, ubuntu-latest, julia)	1m 29s
	50m 24s

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