tests

first wave of multi_ts changes #1338

Job	Run time
canceller	4s
tests-Windows-CLI (mingw64, x86_64, 3.8)	11m 45s
tests-Unix-GUI (ubuntu-20.04, 5.9.5, 7)	5m 29s
tests-Windows-CLI (ucrt64, ucrt-x86_64, 3.8)	11m 39s
tests-Windows-GUI (mingw64, x86_64)	12m 49s
tests-Windows-GUI (ucrt64, ucrt-x86_64)	12m 57s
tests-Unix-GUI (ubuntu-20.04, 5.15.2, 11)	5m 56s
tests-Unix-CLI (ubuntu-20.04, 7, 3.8)	3m 42s
tests-Unix-GUI (ubuntu-22.04, 5.15.2, 12)	6m 12s
tests-windows-latest-pacman (mingw64, x86_64)	1m 40s
tests-Unix-CLI (ubuntu-20.04, 11, 3.9)	3m 41s
tests-Unix-GUI (ubuntu-22.04, 6.7.2, 12)	7m 48s
tests-windows-latest-pacman (ucrt64, ucrt-x86_64)	1m 38s
tests-Unix-CLI (macos-13, 3.9)	7m 23s
tests-Unix-GUI (macos-12, 5.9.5)	1s
tests-Unix-CLI (macos-15, 3.9)	3m 12s
tests-Unix-GUI (macos-13, 5.15.2)	7m 51s
tests-Unix-GUI (macos-13, 6.7.2)	7m 27s
	1h 51m 14s

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