Tests

Fix #20958: Support .git/info/exclude for --exclude-gitignore #21845

Job	Run time
Test mypyc suite with 32-bit Python	8m 20s
Test suite with py311-ubuntu	9m 33s
Test suite with py313-ubuntu, mypyc-compiled	15m 18s
Test suite with py310-ubuntu, mypyc-compiled	15m 55s
Parallel tests with py314-windows-64, interpreted	8m 17s
Test suite with py314-windows-64	28m 14s
Test suite with py314-ubuntu, mypyc-compiled	14m 51s
Parallel tests with py314-ubuntu, interpreted	25m 32s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 56s
Test suite with py312-ubuntu	10m 6s
mypyc runtime tests with py310-ubuntu	6m 38s
Formatting and code style with Black + ruff	2m 1s
Test suite with py314t-ubuntu, mypyc-compiled	17m 5s
Type check our own code (py310-windows-64)	1m 48s
mypyc runtime tests with py313-macos	4m 51s
Type check our own code (py310-ubuntu)	1m 14s
	3h 16m 39s

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