Support requesting latest nightly with `tools: nightly` #5139

Job	Run time
Config export (windows-latest, linked)	2m 1s
Config export (macos-latest, linked)	1m 2s
Config export (windows-latest, nightly-latest)	2m 35s
Config export (macos-latest, nightly-latest)	1m 36s
Config export (ubuntu-latest, nightly-latest)	59s
Config export (ubuntu-latest, linked)	1m 46s
	9m 59s

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