Tests

fix crash resolving cross-refs to suppressed modules #20413

Job	Run time
Test mypyc suite with 32-bit Python	9m 28s
Test suite with py312-ubuntu	8m 49s
Test suite with py310-ubuntu, mypyc-compiled	14m 52s
Parallel tests with py314-ubuntu, interpreted	22m 34s
mypyc runtime tests with py313-macos	7m 6s
Test suite with py314-windows-64	26m 27s
Test suite with py314-ubuntu, mypyc-compiled	13m 57s
Test suite with py314t-ubuntu, mypyc-compiled	17m 8s
mypyc runtime tests with py310-ubuntu	5m 25s
Test suite with py311-ubuntu	8m 52s
Test suite with py313-ubuntu, mypyc-compiled	13m 35s
Type check our own code (py310-ubuntu)	1m 40s
Parallel tests with py314-ubuntu, mypyc-compiled	28m 24s
Type check our own code (py310-windows-64)	2m 29s
Formatting and code style with Black + ruff	1m 48s
	3h 2m 34s

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