Add experimental functionality for labelling PRs by their size #6067

Job	Run time
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.18.4)	1m 52s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.19.4)	1m 37s
Go: tracing with legacy workflow (macos-latest, stable-v2.20.7)	5m 56s
Go: tracing with legacy workflow (macos-latest, stable-v2.19.4)	6m 33s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.20.7)	1m 14s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.22.4)	1m 23s
Go: tracing with legacy workflow (macos-latest, stable-v2.18.4)	4m 28s
Go: tracing with legacy workflow (macos-latest, stable-v2.17.6)	5m 16s
Go: tracing with legacy workflow (macos-latest, stable-v2.21.4)	6m 1s
Go: tracing with legacy workflow (macos-latest, default)	6m 8s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.17.6)	1m 22s
Go: tracing with legacy workflow (macos-latest, linked)	4m 54s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.21.4)	1m 34s
Go: tracing with legacy workflow (macos-latest, stable-v2.22.4)	6m 31s
Go: tracing with legacy workflow (ubuntu-latest, nightly-latest)	1m 20s
Go: tracing with legacy workflow (ubuntu-latest, linked)	1m 20s
Go: tracing with legacy workflow (ubuntu-latest, default)	1m 18s
Go: tracing with legacy workflow (macos-latest, nightly-latest)	5m 50s
	1h 4m 37s

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