Add experimental functionality for labelling PRs by their size #6063

Job	Run time
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.18.4)	35s
Go: tracing with legacy workflow (macos-latest, stable-v2.17.6)	35s
Go: tracing with legacy workflow (macos-latest, stable-v2.21.4)	37s
Go: tracing with legacy workflow (macos-latest, stable-v2.20.7)	37s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.17.6)	35s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.19.4)	34s
Go: tracing with legacy workflow (ubuntu-latest, nightly-latest)	38s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.22.4)	36s
Go: tracing with legacy workflow (macos-latest, stable-v2.18.4)	35s
Go: tracing with legacy workflow (macos-latest, default)	37s
Go: tracing with legacy workflow (macos-latest, stable-v2.19.4)	37s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.20.7)	35s
Go: tracing with legacy workflow (macos-latest, nightly-latest)	37s
Go: tracing with legacy workflow (ubuntu-latest, default)	37s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.21.4)	35s
Go: tracing with legacy workflow (macos-latest, linked)	37s
Go: tracing with legacy workflow (ubuntu-latest, linked)	38s
Go: tracing with legacy workflow (macos-latest, stable-v2.22.4)	37s
	10m 52s

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