Tests

Invalidate cache when --enable-incomplete-feature changes (fixes #20845) #20933

Job	Run time
Parallel tests with py314-ubuntu, mypyc-compiled	28m 49s
Test mypyc suite with 32-bit Python	9m 35s
Parallel tests with py314-ubuntu, interpreted	24m 38s
Test suite with py310-ubuntu, mypyc-compiled	15m 10s
Test suite with py313-ubuntu, mypyc-compiled	13m 31s
Test suite with py311-ubuntu	8m 50s
mypyc runtime tests with py310-ubuntu	5m 41s
Formatting and code style with Black + ruff	1m 56s
Parallel tests with py314-windows-64, interpreted	10m 51s
Test suite with py314t-ubuntu, mypyc-compiled	16m 47s
mypyc runtime tests with py313-macos	4m 21s
Test suite with py314-windows-64	28m 9s
Type check our own code (py310-windows-64)	2m 25s
Test suite with py312-ubuntu	9m 2s
Type check our own code (py310-ubuntu)	1m 39s
Test suite with py314-ubuntu, mypyc-compiled	14m 13s
	3h 15m 37s

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