Support requesting latest nightly with `tools: nightly` #5138

Job	Run time
Config export (windows-latest, linked)	31s
Config export (ubuntu-latest, nightly-latest)	54s
Config export (ubuntu-latest, linked)	53s
Config export (macos-latest, nightly-latest)	50s
Config export (macos-latest, linked)	52s
Config export (windows-latest, nightly-latest)	58s
	4m 58s

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