Tests

[mypyc] Document free threading and other doc updates (#21494) #22296

Job	Run time
Test mypyc suite with 32-bit Python	10m 20s
Test suite with py310-ubuntu, mypyc-compiled	16m 44s
Test suite with py315-ubuntu, mypyc-compiled	15m 48s
Test suite with py311-ubuntu	9m 37s
Test suite with py312-ubuntu	10m 9s
Test suite with py313-ubuntu, mypyc-compiled	16m 22s
mypyc runtime tests with py313-macos	5m 25s
Test suite with py314-windows-64	30m 40s
Test suite with py314-ubuntu, mypyc-compiled	15m 22s
Test suite with py314t-ubuntu, mypyc-compiled	17m 41s
mypyc runtime tests with py310-ubuntu	6m 53s
Parallel tests with py314-ubuntu, mypyc-compiled	29m 26s
Type check our own code (py310-windows-64)	2m 50s
Formatting and code style with Black + ruff	2m 5s
Type check our own code (py310-ubuntu)	1m 4s
Parallel tests with py314-ubuntu, interpreted	24m 31s
Parallel tests with py314-windows-64, interpreted	12m 34s
	3h 47m 31s

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