Tests

Remove logic for legacy bundled stubs (#18372) #21824

Job	Run time
Test mypyc suite with 32-bit Python	10m 51s
Test suite with py314-ubuntu, mypyc-compiled	15m 18s
Type check our own code (py310-windows-64)	1m 44s
mypyc runtime tests with py310-ubuntu	6m 14s
Test suite with py314t-ubuntu, mypyc-compiled	17m 12s
Test suite with py311-ubuntu	8m 51s
Test suite with py310-ubuntu, mypyc-compiled	16m 12s
Parallel tests with py314-ubuntu, interpreted	23m 56s
Test suite with py314-windows-64	27m 8s
Parallel tests with py314-windows-64, interpreted	7m 51s
Formatting and code style with Black + ruff	1m 30s
Test suite with py312-ubuntu	9m 34s
Parallel tests with py314-ubuntu, mypyc-compiled	25m 45s
Type check our own code (py310-ubuntu)	1m 9s
Test suite with py313-ubuntu, mypyc-compiled	15m 25s
mypyc runtime tests with py313-macos	4m 52s
	3h 13m 32s

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