Add experimental functionality for labelling PRs by their size #6066

Job	Run time
Go: tracing with legacy workflow (macos-latest, stable-v2.17.6)	4m 31s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.20.7)	1m 18s
Go: tracing with legacy workflow (macos-latest, stable-v2.21.4)	5m 54s
Go: tracing with legacy workflow (ubuntu-latest, linked)	1m 15s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.17.6)	1m 53s
Go: tracing with legacy workflow (macos-latest, stable-v2.20.7)	5m 12s
Go: tracing with legacy workflow (macos-latest, linked)	6m 34s
Go: tracing with legacy workflow (macos-latest, stable-v2.18.4)	5m 35s
Go: tracing with legacy workflow (macos-latest, stable-v2.22.4)	6m 29s
Go: tracing with legacy workflow (ubuntu-latest, default)	1m 22s
Go: tracing with legacy workflow (macos-latest, default)	5m 44s
Go: tracing with legacy workflow (macos-latest, stable-v2.19.4)	6m 28s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.22.4)	1m 8s
Go: tracing with legacy workflow (ubuntu-latest, nightly-latest)	1m 15s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.21.4)	1m 10s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.19.4)	1m 38s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.18.4)	1m 33s
Go: tracing with legacy workflow (macos-latest, nightly-latest)	7m 5s
	1h 6m 4s

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