Support requesting latest nightly with `tools: nightly` #5730

Job	Run time
Ruby analysis (macos-latest, linked)	54s
Ruby analysis (macos-latest, nightly-latest)	1m 6s
Ruby analysis (ubuntu-latest, default)	57s
Ruby analysis (ubuntu-latest, nightly-latest)	51s
Ruby analysis (macos-latest, default)	1m 13s
Ruby analysis (ubuntu-latest, linked)	48s
	5m 49s

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