Support shorthand forms for `getRemoteConfig` #8246

Job	Run time
Ruby analysis (ubuntu-latest, linked)	38s
Ruby analysis (macos-latest, linked)	46s
Ruby analysis (ubuntu-latest, nightly-latest)	52s
Ruby analysis (macos-latest, nightly-latest)	1m 6s
Ruby analysis (macos-latest, default)	54s
Ruby analysis (ubuntu-latest, default)	35s
	4m 51s

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