Tests

Use `PYODIDE` environment variable for Emscripten cross-compilation d… #22703

Job	Run time
Test mypyc suite with 32-bit Python	11m 0s
Test suite with py310-ubuntu, mypyc-compiled	16m 35s
mypyc runtime tests with py313-macos	6m 7s
Parallel tests with py314-ubuntu, interpreted	25m 48s
Test suite with py314-ubuntu, mypyc-compiled	15m 30s
Test suite with py313-ubuntu, mypyc-compiled	15m 35s
Test suite with py315-ubuntu, mypyc-compiled	16m 19s
Formatting and code style with Black + ruff	2m 4s
Parallel tests with py314-ubuntu, mypyc-compiled	27m 3s
Type check our own code (py310-windows-64)	1m 59s
Test suite with py312-ubuntu	10m 4s
Parallel tests with py314-windows-64, interpreted	12m 32s
Type check our own code (py310-ubuntu)	47s
Test suite with py311-ubuntu	9m 53s
Test suite with py314-windows-64	30m 21s
Test suite with py314t-ubuntu, mypyc-compiled	18m 28s
mypyc runtime tests with py310-ubuntu	7m 37s
	3h 47m 42s

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