Tests

Allow disabling extra flags with MYPYC_NO_EXTRA_FLAGS env variable (#… #19928

Job	Run time
Test mypyc suite with 32-bit Python	9m 19s
Test suite with py314-ubuntu, mypyc-compiled	14m 16s
Test suite with py314t-ubuntu, mypyc-compiled	15m 58s
Test suite with py313-ubuntu, mypyc-compiled	13m 54s
Test suite with py314-windows-64	26m 48s
Test suite with py312-ubuntu	10m 0s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 46s
mypyc runtime tests with py310-ubuntu	5m 3s
mypyc runtime tests with py313-macos	4m 16s
Parallel tests with py314-ubuntu, interpreted	23m 37s
Test suite with py310-ubuntu, mypyc-compiled	13m 47s
Formatting and code style with Black + ruff	2m 9s
Type check our own code (py310-ubuntu)	1m 44s
Test suite with py311-ubuntu	9m 5s
Type check our own code (py310-windows-64)	2m 22s
	2h 59m 4s

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