Automatically download Python distributions for `virtual` environments #1745

Job	Run time
Downstream builds with Python 3.8	51s
CLI responsiveness with latest Python	2m 37s
Downstream builds with Python 3.9	1m 0s
Python 3.8 on Linux	5m 13s
Downstream builds with Python 3.10	53s
Python 3.9 on Linux	5m 29s
Downstream builds with Python 3.11	58s
Python 3.10 on Linux	4m 31s
Python 3.11 on Linux	5m 6s
Python 3.12 on Linux	6m 25s
Python 3.8 on Windows	8m 37s
Python 3.9 on Windows	9m 45s
Python 3.10 on Windows	8m 45s
Python 3.11 on Windows	8m 25s
Python 3.12 on Windows	9m 27s
Python 3.8 on macOS	4m 32s
Python 3.9 on macOS	4m 59s
Python 3.10 on macOS	4m 43s
Python 3.11 on macOS	7m 3s
Python 3.12 on macOS	10m 44s
Report coverage	0s
check	4s
	1h 50m 7s

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