Add experimental functionality for labelling PRs by their size #1762

Job	Run time
Upload debug artifacts after failure in analyze (linked)	3m 28s
Upload debug artifacts after failure in analyze (default)	3m 20s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	1m 53s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 19s
Download and check debug artifacts after failure in analyze	12s
	12m 12s

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