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Fix Windows env filtering and React test output stalls #1900

Job	Run time
build and typecheck (ubuntu-latest)	1m 34s
test (ubuntu-latest, 2/2)	1m 40s
test (ubuntu-latest, unit)	2m 29s
test (ubuntu-latest, 1/2)	1m 49s
live-e2e	0s
done	3s
	7m 35s