Support requesting latest nightly with `tools: nightly` #5141

Job	Run time
Config export (macos-latest, nightly-latest)	1m 6s
Config export (ubuntu-latest, linked)	1m 5s
Config export (macos-latest, linked)	1m 28s
Config export (windows-latest, linked)	4m 0s
Config export (ubuntu-latest, nightly-latest)	58s
Config export (windows-latest, nightly-latest)	2m 11s
	10m 48s

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