Tests

Remove logic for legacy bundled stubs #20216

Job	Run time
Test mypyc suite with 32-bit Python	38s
Test suite with py312-ubuntu	38s
Test suite with py314-ubuntu, mypyc-compiled	42s
Test suite with py314-windows-64	36s
Test suite with py311-ubuntu	36s
Test suite with py314t-ubuntu, mypyc-compiled	43s
Parallel tests with py314-ubuntu, mypyc-compiled	43s
Test suite with py313-ubuntu, mypyc-compiled	43s
mypyc runtime tests with py313-macos	35s
Type check our own code (py310-ubuntu)	45s
Test suite with py310-ubuntu, mypyc-compiled	42s
Parallel tests with py314-ubuntu, interpreted	41s
Formatting and code style with Black + ruff	47s
Type check our own code (py310-windows-64)	43s
mypyc runtime tests with py310-ubuntu	45s
	10m 17s

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