Support shorthand forms for `getRemoteConfig` #8245

Job	Run time
Ruby analysis (ubuntu-latest, nightly-latest)	40s
Ruby analysis (ubuntu-latest, default)	39s
Ruby analysis (ubuntu-latest, linked)	44s
Ruby analysis (macos-latest, linked)	1m 12s
Ruby analysis (macos-latest, default)	1m 13s
Ruby analysis (macos-latest, nightly-latest)	57s
	5m 25s

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