Tests

[stubtest] fix duplicate errors with invalid line numbers #19786

Job	Run time
Test mypyc suite with 32-bit Python	9m 25s
Test suite with py313-ubuntu, mypyc-compiled	14m 12s
Test suite with py311-ubuntu	9m 8s
Test suite with py310-ubuntu, mypyc-compiled	13m 51s
mypyc runtime tests with py310-ubuntu	5m 10s
Test suite with py314-windows-64	27m 8s
Test suite with py312-ubuntu	10m 0s
Test suite with py314-ubuntu, mypyc-compiled	14m 14s
Test suite with py314t-ubuntu, mypyc-compiled	16m 4s
mypyc runtime tests with py313-macos	5m 12s
Parallel tests with py314-ubuntu, interpreted	23m 52s
Type check our own code (py310-ubuntu)	1m 38s
Parallel tests with py314-ubuntu, mypyc-compiled	26m 39s
Formatting and code style with Black + ruff	1m 55s
Type check our own code (py310-windows-64)	2m 26s
	3h 0m 54s

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