src/vs/platform/userDataSync/common/userDataSync.ts/getDisallowedIgnoredSettings
export function getDisallowedIgnoredSettings(): string[] {
	const allSettings = Registry.as<IConfigurationRegistry>(ConfigurationExtensions.Configuration).getConfigurationProperties();
	return Object.keys(allSettings).filter(setting => !!allSettings[setting].disallowSyncIgnore);
}