Add experimental functionality for labelling PRs by their size #1758

Job	Run time
Upload debug artifacts after failure in analyze (linked)	4m 30s
Upload debug artifacts after failure in analyze (default)	3m 6s
Upload debug artifacts after failure in analyze (stable-v2.20.3)	2m 1s
Upload debug artifacts after failure in analyze (nightly-latest)	3m 41s
Download and check debug artifacts after failure in analyze	10s
	13m 28s

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