Testing: Provide default value for more environment variables in `setupActionsVars` #7165

Job	Run time
Go: tracing with legacy workflow (macos-latest, stable-v2.18.4)	5m 47s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.17.6)	1m 20s
Go: tracing with legacy workflow (macos-latest, default)	5m 5s
Go: tracing with legacy workflow (macos-latest, stable-v2.21.4)	4m 25s
Go: tracing with legacy workflow (macos-latest, stable-v2.22.4)	5m 53s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.22.4)	1m 17s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.20.7)	1m 13s
Go: tracing with legacy workflow (macos-latest, stable-v2.19.4)	6m 0s
Go: tracing with legacy workflow (ubuntu-latest, linked)	1m 10s
Go: tracing with legacy workflow (macos-latest, nightly-latest)	5m 34s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.18.4)	1m 30s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.21.4)	1m 17s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.19.4)	1m 25s
Go: tracing with legacy workflow (macos-latest, linked)	4m 51s
Go: tracing with legacy workflow (macos-latest, stable-v2.20.7)	5m 14s
Go: tracing with legacy workflow (ubuntu-latest, default)	1m 21s
Go: tracing with legacy workflow (macos-latest, stable-v2.17.6)	4m 50s
Go: tracing with legacy workflow (ubuntu-latest, nightly-latest)	1m 14s
	59m 26s

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