Tests

Use `PYODIDE` environment variable for Emscripten cross-compilation detection #22699

Job	Run time
Test mypyc suite with 32-bit Python	11m 19s
Test suite with py314t-ubuntu, mypyc-compiled	20m 1s
Test suite with py314-windows-64	32m 41s
Type check our own code (py310-windows-64)	2m 22s
Test suite with py310-ubuntu, mypyc-compiled	17m 7s
Parallel tests with py314-ubuntu, interpreted	26m 58s
mypyc runtime tests with py313-macos	7m 31s
Test suite with py314-ubuntu, mypyc-compiled	15m 54s
Test suite with py315-ubuntu, mypyc-compiled	16m 24s
Test suite with py312-ubuntu	10m 27s
mypyc runtime tests with py310-ubuntu	7m 40s
Parallel tests with py314-ubuntu, mypyc-compiled	30m 18s
Test suite with py311-ubuntu	9m 45s
Type check our own code (py310-ubuntu)	1m 7s
Test suite with py313-ubuntu, mypyc-compiled	15m 59s
Formatting and code style with Black + ruff	1m 51s
Parallel tests with py314-windows-64, interpreted	13m 36s
	4h 1m 0s

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