Tests

Clean-up classes nested in functions #22389

Job	Run time
Test mypyc suite with 32-bit Python	11m 24s
Test suite with py313-ubuntu, mypyc-compiled	15m 53s
Test suite with py310-ubuntu, mypyc-compiled	16m 58s
Test suite with py315-ubuntu, mypyc-compiled	15m 50s
Test suite with py312-ubuntu	10m 27s
Test suite with py311-ubuntu	9m 57s
Test suite with py314-windows-64	31m 19s
mypyc runtime tests with py310-ubuntu	7m 32s
Test suite with py314-ubuntu, mypyc-compiled	16m 31s
Parallel tests with py314-ubuntu, interpreted	24m 51s
Type check our own code (py310-ubuntu)	1m 11s
Formatting and code style with Black + ruff	1m 50s
Type check our own code (py310-windows-64)	1m 51s
mypyc runtime tests with py313-macos	5m 12s
Test suite with py314t-ubuntu, mypyc-compiled	17m 38s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 22s
Parallel tests with py314-windows-64, interpreted	9m 35s
	3h 48m 21s

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