Support requesting latest nightly with `tools: nightly` #7795

Job	Run time
Split workflow (macos-latest, nightly-latest)	1m 22s
Split workflow (ubuntu-latest, default)	1m 38s
Split workflow (macos-latest, default)	1m 17s
Split workflow (ubuntu-latest, nightly-latest)	1m 14s
Split workflow (macos-latest, linked)	1m 35s
Split workflow (ubuntu-latest, linked)	1m 20s
	8m 26s

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