public static Mapping getUnclassifiedRoot(ConfigurationContext context) throws Exception {
        GlobalConfigurationCategory.Unclassified unclassified = ExtensionList.lookup(
                        GlobalConfigurationCategory.Unclassified.class)
                .get(0);

        GlobalConfigurationCategoryConfigurator unclassifiedConfigurator =
                new GlobalConfigurationCategoryConfigurator(unclassified);
        return Objects.requireNonNull(unclassifiedConfigurator.describe(
                        unclassifiedConfigurator.getTargetComponent(context), context))
                .asMapping();
    }
Gets the "unclassified" root mapping.
<p>
Example usage:
<pre>{@code
ConfiguratorRegistry registry = ConfiguratorRegistry.get();
ConfigurationContext context = new ConfigurationContext(registry);
CNode configNode = getUnclassifiedRoot(context).get("my-plugin-attribute");}</pre>

@param context the configuration context
@return the "unclassified" root mapping
@throws Exception something's not right...
test-harness/src/main/java/io/jenkins/plugins/casc/misc/Util.java