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refactor(tools-shell): dedupe shared web-fetch, convert, signal, and timer helpers #2540

Job	Run time
test (1/4)	38s
static-analysis	48s
test (3/4)	1m 9s
test (4/4)	40s
build	14s
test (2/4)	53s
test (one-process pollution detector)	0s
prettier	2s
typecheck	2s
eslint	2s
build-and-test	3s
test (src)	4s
	4m 35s