Compute PR diff-ranges during init #1851

Job	Run time
Upload debug artifacts after failure in analyze (linked)	2m 49s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 17s
Upload debug artifacts after failure in analyze (default)	3m 8s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 51s
Download and check debug artifacts after failure in analyze	17s
	11m 22s

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