Add notes about the use of UV in hatch-test #2837

Job	Run time
Downstream builds with Python 3.8	37s
Python 3.8 on Linux	2m 24s
Downstream builds with Python 3.9	35s
Python 3.9 on Linux	2m 7s
Downstream builds with Python 3.10	40s
Python 3.10 on Linux	1m 56s
Downstream builds with Python 3.11	37s
Python 3.11 on Linux	1m 47s
Downstream builds with Python 3.12	40s
Python 3.12 on Linux	2m 20s
Downstream builds with Python 3.13	1m 6s
Python 3.13 on Linux	2m 23s
Python 3.8 on Windows	4m 40s
Python 3.9 on Windows	4m 15s
Python 3.10 on Windows	4m 14s
Python 3.11 on Windows	3m 57s
Python 3.12 on Windows	4m 19s
Python 3.13 on Windows	4m 52s
Python 3.8 on macOS	1m 48s
Python 3.9 on macOS	1m 9s
Python 3.10 on macOS	1m 14s
Python 3.11 on macOS	1m 8s
Python 3.12 on macOS	1m 26s
Python 3.13 on macOS	1m 18s
Report coverage	31s
check	4s
	52m 7s

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