Add extra permission to mergeback workflow #4319

Job	Run time
Go: tracing with legacy workflow (macos-latest, stable-v2.15.5)	3m 51s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.16.6)	1m 20s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.15.5)	1m 18s
Go: tracing with legacy workflow (macos-latest, stable-v2.16.6)	4m 3s
Go: tracing with legacy workflow (macos-latest, stable-v2.18.4)	3m 43s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.18.4)	1m 35s
Go: tracing with legacy workflow (macos-latest, stable-v2.19.4)	4m 39s
Go: tracing with legacy workflow (ubuntu-latest, default)	1m 45s
Go: tracing with legacy workflow (macos-latest, nightly-latest)	4m 14s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.17.6)	1m 12s
Go: tracing with legacy workflow (macos-latest, default)	4m 53s
Go: tracing with legacy workflow (ubuntu-latest, nightly-latest)	1m 6s
Go: tracing with legacy workflow (macos-latest, stable-v2.17.6)	3m 4s
Go: tracing with legacy workflow (ubuntu-latest, linked)	1m 4s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.19.4)	1m 22s
Go: tracing with legacy workflow (macos-latest, linked)	4m 15s
	43m 24s

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