Support requesting latest nightly with `tools: nightly` #5731

Job	Run time
Go: tracing with custom build steps (macos-latest, stable-v2.17.6)	1m 47s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.19.4)	1m 23s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.17.6)	1m 16s
Go: tracing with custom build steps (macos-latest, stable-v2.18.4)	1m 47s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.21.4)	1m 5s
Go: tracing with custom build steps (macos-latest, stable-v2.20.7)	2m 0s
Go: tracing with custom build steps (macos-latest, stable-v2.19.4)	2m 23s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.20.7)	1m 8s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.18.4)	1m 14s
Go: tracing with custom build steps (macos-latest, stable-v2.21.4)	2m 10s
Go: tracing with custom build steps (macos-latest, linked)	2m 15s
Go: tracing with custom build steps (macos-latest, stable-v2.22.4)	1m 51s
Go: tracing with custom build steps (macos-latest, nightly-latest)	2m 10s
Go: tracing with custom build steps (ubuntu-latest, default)	53s
Go: tracing with custom build steps (macos-latest, default)	2m 17s
Go: tracing with custom build steps (ubuntu-latest, nightly-latest)	1m 4s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.22.4)	1m 5s
Go: tracing with custom build steps (ubuntu-latest, linked)	1m 9s
	28m 57s

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