Tests

[mypyc]: support :s and :d in generate_format_ops #20436

Job	Run time
Test mypyc suite with 32-bit Python	8m 52s
Test suite with py312-ubuntu	8m 33s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 12s
Parallel tests with py314-ubuntu, interpreted	24m 3s
mypyc runtime tests with py310-ubuntu	5m 38s
Test suite with py311-ubuntu	8m 52s
Test suite with py314-windows-64	26m 45s
Type check our own code (py310-ubuntu)	1m 40s
Test suite with py314t-ubuntu, mypyc-compiled	17m 20s
Type check our own code (py310-windows-64)	2m 28s
Test suite with py313-ubuntu, mypyc-compiled	13m 59s
Test suite with py310-ubuntu, mypyc-compiled	15m 0s
mypyc runtime tests with py313-macos	7m 43s
Test suite with py314-ubuntu, mypyc-compiled	13m 38s
Formatting and code style with Black + ruff	1m 54s
	3h 3m 37s

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