Support requesting latest nightly with `tools: nightly` #5733

Job	Run time
Go: tracing with custom build steps (ubuntu-latest, stable-v2.18.4)	1m 16s
Go: tracing with custom build steps (macos-latest, stable-v2.20.7)	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-v2.19.4)	1m 6s
Go: tracing with custom build steps (macos-latest, stable-v2.17.6)	2m 29s
Go: tracing with custom build steps (macos-latest, stable-v2.19.4)	2m 0s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.17.6)	1m 21s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.21.4)	1m 3s
Go: tracing with custom build steps (macos-latest, stable-v2.21.4)	2m 41s
Go: tracing with custom build steps (ubuntu-latest, stable-v2.22.4)	1m 9s
Go: tracing with custom build steps (macos-latest, stable-v2.18.4)	2m 4s
Go: tracing with custom build steps (macos-latest, linked)	2m 17s
Go: tracing with custom build steps (macos-latest, nightly-latest)	2m 57s
Go: tracing with custom build steps (ubuntu-latest, default)	1m 8s
Go: tracing with custom build steps (macos-latest, default)	2m 14s
Go: tracing with custom build steps (macos-latest, stable-v2.22.4)	2m 10s
Go: tracing with custom build steps (ubuntu-latest, nightly-latest)	54s
Go: tracing with custom build steps (ubuntu-latest, linked)	1m 2s
	31m 11s

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