Tests

[mypyc]: support :s and :d in generate_format_ops #20004

Job	Run time
Test mypyc suite with 32-bit Python	9m 14s
Test suite with py312-ubuntu	9m 50s
Test suite with py314-ubuntu, mypyc-compiled	1m 4s
Test suite with py314t-ubuntu, mypyc-compiled	1m 24s
Test suite with py313-ubuntu, mypyc-compiled	1m 6s
Type check our own code (py310-windows-64)	2m 29s
Test suite with py310-ubuntu, mypyc-compiled	1m 13s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 6s
Test suite with py311-ubuntu	9m 15s
Formatting and code style with Black + ruff	1m 48s
Type check our own code (py310-ubuntu)	1m 37s
Parallel tests with py314-ubuntu, interpreted	20m 50s
mypyc runtime tests with py313-macos	5m 45s
mypyc runtime tests with py310-ubuntu	5m 15s
Test suite with py314-windows-64	20m 46s
	1h 32m 42s

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