Support requesting latest nightly with `tools: nightly` #5736

Job	Run time
Go: tracing with custom build steps (ubuntu-latest, stable-v2.18.4)	1m 14s
Go: tracing with custom build steps (macos-latest, stable-v2.20.7)	3m 12s
Go: tracing with custom build steps (macos-latest, stable-v2.18.4)	2m 13s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.20.7)	1m 7s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.22.4)	1m 4s
Go: tracing with custom build steps (macos-latest, stable-v2.22.4)	2m 47s
Go: tracing with custom build steps (macos-latest, stable-v2.17.6)	1m 57s
Go: tracing with custom build steps (ubuntu-latest, default)	1m 5s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.19.4)	1m 32s
Go: tracing with custom build steps (macos-latest, stable-v2.21.4)	2m 47s
Go: tracing with custom build steps (macos-latest, stable-v2.19.4)	2m 39s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.21.4)	1m 4s
Go: tracing with custom build steps (macos-latest, linked)	2m 31s
Go: tracing with custom build steps (macos-latest, default)	2m 8s
Go: tracing with custom build steps (ubuntu-latest, nightly-latest)	1m 8s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.17.6)	1m 2s
Go: tracing with custom build steps (macos-latest, nightly-latest)	3m 10s
Go: tracing with custom build steps (ubuntu-latest, linked)	1m 0s
	33m 40s

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