Tests

Allow nativeparse to parse source code directly #21996

Job	Run time
Test mypyc suite with 32-bit Python	11m 17s
Test suite with py313-ubuntu, mypyc-compiled	1m 14s
Test suite with py314t-ubuntu, mypyc-compiled	1m 25s
Test suite with py312-ubuntu	10m 8s
Test suite with py314-windows-64	29m 23s
Test suite with py314-ubuntu, mypyc-compiled	1m 13s
Test suite with py310-ubuntu, mypyc-compiled	1m 30s
Test suite with py311-ubuntu	9m 55s
Parallel tests with py314-windows-64, interpreted	8m 56s
mypyc runtime tests with py310-ubuntu	7m 0s
mypyc runtime tests with py313-macos	8m 19s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 13s
Formatting and code style with Black + ruff	2m 1s
Parallel tests with py314-ubuntu, interpreted	19m 33s
Type check our own code (py310-ubuntu)	34s
Type check our own code (py310-windows-64)	1m 7s
	1h 54m 48s

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