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chore: delete five verified-dead artifacts #3978

Job	Run time
build	12s
test (2/4)	1m 0s
static-analysis	30s
test (1/4)	35s
test (3/4)	54s
test (4/4)	41s
test (one-process pollution detector)	0s
typecheck	2s
prettier	2s
eslint	2s
build-and-test	3s
test (src)	4s
	4m 5s