Tests

Fix TypeIs narrowing before isinstance #22543

Job	Run time
Test mypyc suite with 32-bit Python	2m 2s
Test suite with py315-ubuntu, mypyc-compiled	1m 40s
Test suite with py314-windows-64	2m 5s
Test suite with py311-ubuntu	2m 13s
Test suite with py313-ubuntu, mypyc-compiled	1m 37s
Test suite with py312-ubuntu	2m 11s
Test suite with py314-ubuntu, mypyc-compiled	1m 12s
Parallel tests with py314-ubuntu, interpreted	2m 15s
mypyc runtime tests with py310-ubuntu	2m 14s
Test suite with py314t-ubuntu, mypyc-compiled	1m 27s
mypyc runtime tests with py313-macos	2m 18s
Type check our own code (py310-ubuntu)	59s
Formatting and code style with Black + ruff	2m 0s
Parallel tests with py314-ubuntu, mypyc-compiled	1m 24s
Type check our own code (py310-windows-64)	1m 42s
Parallel tests with py314-windows-64, interpreted	2m 11s
Test suite with py310-ubuntu, mypyc-compiled	1m 31s
	31m 1s

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