feat: add CI output comparison between branches #87

Job	Run time
output-comparison	8m 8s
smoke-test (18.x)	56s
root-tests (18.x)	30s
lint (18.x)	26s
smoke-test (latest)	58s
smoke-test (22.x)	58s
build-and-test (18.x, utils)	32s
build-and-test (18.x, assertion-monitor)	46s
build-and-test (18.x, retryable-monitor)	37s
build-and-test (18.x, batch-poster-monitor)	39s
	14m 30s

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