Support requesting latest nightly with `tools: nightly` #7793

Job	Run time
Split workflow (ubuntu-latest, default)	1m 21s
Split workflow (ubuntu-latest, nightly-latest)	1m 27s
Split workflow (macos-latest, default)	1m 32s
Split workflow (macos-latest, linked)	1m 18s
Split workflow (macos-latest, nightly-latest)	1m 55s
Split workflow (ubuntu-latest, linked)	1m 30s
	9m 3s

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