Move diff-range computation into utils #1835

Job	Run time
Upload debug artifacts after failure in analyze (linked)	3m 44s
Upload debug artifacts after failure in analyze (default)	3m 20s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 14s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	2m 22s
Download and check debug artifacts after failure in analyze	11s
	12m 51s

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