test: verify CI output comparison diff #80

Job	Run time
output-comparison	8m 12s
lint (18.x)	26s
smoke-test (latest)	1m 2s
build-and-test (18.x, batch-poster-monitor)	41s
build-and-test (18.x, retryable-monitor)	35s
smoke-test (18.x)	58s
build-and-test (18.x, assertion-monitor)	49s
smoke-test (22.x)	57s
build-and-test (18.x, utils)	38s
root-tests (18.x)	37s
	14m 55s

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