Tests

Add support for installing stubs from pylock files #22046

Job	Run time
Test mypyc suite with 32-bit Python	6m 9s
Test suite with py310-ubuntu, mypyc-compiled	6m 6s
Parallel tests with py314-ubuntu, interpreted	6m 10s
Test suite with py313-ubuntu, mypyc-compiled	6m 7s
Parallel tests with py314-windows-64, interpreted	6m 2s
Test suite with py314t-ubuntu, mypyc-compiled	6m 6s
Test suite with py314-windows-64	6m 0s
Test suite with py311-ubuntu	6m 8s
Test suite with py314-ubuntu, mypyc-compiled	6m 5s
Type check our own code (py310-ubuntu)	1m 7s
mypyc runtime tests with py310-ubuntu	6m 6s
Parallel tests with py314-ubuntu, mypyc-compiled	6m 8s
Type check our own code (py310-windows-64)	1m 51s
Test suite with py312-ubuntu	6m 57s
Formatting and code style with Black + ruff	1m 52s
mypyc runtime tests with py313-macos	5m 24s
	1h 24m 18s

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