CL-8980: make read_file continuation failures recoverable rather than terminal #2756

Job	Run time
build	16s
test (1/4)	52s
static-analysis	49s
test (3/4)	31s
test (4/4)	45s
test (2/4)	1m 27s
test (one-process pollution detector)	0s
eslint	2s
prettier	4s
typecheck	3s
test (src)	2s
build-and-test	40s
	5m 31s

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