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test: share signal fixtures and stringify hook signal codes #3932

Job	Run time
build	16s
test (1/4)	45s
static-analysis	44s
test (4/4)	39s
test (3/4)	47s
test (2/4)	51s
test (one-process pollution detector)	0s
prettier	2s
build-and-test	3s
test (src)	3s
eslint	3s
typecheck	2s
	4m 15s