Add experimental functionality for labelling PRs by their size #6068

Job	Run time
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.19.4)	1m 30s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.18.4)	1m 34s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.20.7)	1m 29s
Go: tracing with legacy workflow (macos-latest, stable-v2.18.4)	6m 30s
Go: tracing with legacy workflow (macos-latest, stable-v2.21.4)	5m 6s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.17.6)	1m 27s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.21.4)	1m 19s
Go: tracing with legacy workflow (macos-latest, stable-v2.17.6)	5m 56s
Go: tracing with legacy workflow (ubuntu-latest, default)	1m 24s
Go: tracing with legacy workflow (macos-latest, stable-v2.19.4)	5m 27s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.22.4)	1m 21s
Go: tracing with legacy workflow (macos-latest, default)	4m 35s
Go: tracing with legacy workflow (macos-latest, stable-v2.22.4)	6m 16s
Go: tracing with legacy workflow (ubuntu-latest, nightly-latest)	1m 17s
Go: tracing with legacy workflow (macos-latest, nightly-latest)	4m 37s
Go: tracing with legacy workflow (macos-latest, stable-v2.20.7)	4m 43s
Go: tracing with legacy workflow (ubuntu-latest, linked)	1m 24s
Go: tracing with legacy workflow (macos-latest, linked)	4m 35s
	1h 0m 30s

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