MetadataServiceTest クラスの修正

\:cloud: Metadata API

以下に紹介されているテストクラスは
This is a dummy test class to obtain 100% coverage for the generated WSDL2Apex code, it is not a funcitonal test class
と書かれていますが実際にテストを実行すると89%でした。

https://github.com/financialforcedev/apex-mdapi/blob/master/apex-mdapi/src/classes/MetadataServiceTest.cls


以下はカバー率を上げるための追加メソッドです。
このテストクラスに追加して下さい。(2020/10/30時点で99%）

```
@IsTest
    private static void AddedcoverGeneratedCodeTypes()
    {    
        Test.startTest();
        new MetadataService.LightningBoltFeatures();
        new MetadataService.MacroSettings();
        new MetadataService.ExtendedErrorDetails();
        new MetadataService.RecommendationDefinition();
        new MetadataService.WaveXmdDimension();
        new MetadataService.NetworkBranding();
        new MetadataService.UserCriteria();
        new MetadataService.LightningBoltImages();
        new MetadataService.RecommendationAudience();
        new MetadataService.WaveXmd();
        new MetadataService.LightningExperienceTheme();
        new MetadataService.ProfileCategoryGroupVisibility();
        new MetadataService.CleanDataService();
        new MetadataService.FlowCategoryItems();
        new MetadataService.AppPreferences();
        new MetadataService.SocialCustomerServiceSettings();
        new MetadataService.EmbeddedServiceQuickAction();
        new MetadataService.FlowScreenFieldTranslation();
        new MetadataService.FlowDefinitionTranslation();
        new MetadataService.StrategyNode();
        new MetadataService.Index();
        new MetadataService.WaveXmdDate();
        new MetadataService.PublicGroups();
        new MetadataService.NavigationSubMenu();
        new MetadataService.EmbeddedServiceFieldService();
        new MetadataService.BrandingSet();
        new MetadataService.Users();
        new MetadataService.FieldSetTranslation();
        new MetadataService.CommunityThemeDefinition();
        new MetadataService.CommunityTemplateBundleInfo();
        new MetadataService.UiFormulaCriterion();
        new MetadataService.LightningComponentBundle();
        new MetadataService.FlowScreenFieldInputParameter();
        new MetadataService.Orchestration();
        new MetadataService.ScheduledRecommendation();
        new MetadataService.InsightType();
        new MetadataService.QueueMembers();
        new MetadataService.FileUploadAndDownloadSecuritySettings();
        new MetadataService.LightningBoltItems();
        new MetadataService.ChatterExtension();
        new MetadataService.WaveXmdOrganization();
        new MetadataService.NetworkPageOverride();
        new MetadataService.KnowledgeWorkOrderField();
        new MetadataService.CampaignInfluenceModel();
        new MetadataService.OrchestrationContextEvent();
        new MetadataService.FlowScreenTranslation();
        new MetadataService.CommunityRoles();
        new MetadataService.RoleAndSubordinatesInternal();
        new MetadataService.DashboardFlexTableComponentProperties();
        new MetadataService.IntegrationHubSettings();
        new MetadataService.CommunityThemeSetting();
        new MetadataService.OrchestrationContext();
        new MetadataService.KnowledgeWorkOrderLineItemField();
        new MetadataService.CspTrustedSite();
        new MetadataService.FlowCategory();
        new MetadataService.LightningBolt();
        new MetadataService.CaseSubjectParticle();
        new MetadataService.WaveXmdDimensionSalesforceAction();
        new MetadataService.Roles();
        new MetadataService.FileTypeDispositionAssignmentBean();
        new MetadataService.AppWorkspaceConfig();
        new MetadataService.ScheduledRecommendationDetail();
        new MetadataService.UiFormulaRule();
        new MetadataService.WaveXmdRecordDisplayLookup();
        new MetadataService.IntegrationHubSettingsType();
        new MetadataService.WaveXmdDimensionMember();
        new MetadataService.LiveMessageSettings();
        new MetadataService.ForecastingDisplayedFamilySettings();
        new MetadataService.EmailServicesFunction();
        new MetadataService.IndexField();
        new MetadataService.FlowChoiceTranslation();
        new MetadataService.WaveXmdDimensionCustomAction();
        new MetadataService.FlexiPageTemplateInstance();
        new MetadataService.AppComponentList();
        new MetadataService.KnowledgeWorkOrderLineItemFieldsSettings();
        new MetadataService.ServiceCloudConsoleConfig();
        new MetadataService.BrandingSetProperty();
        new MetadataService.KnowledgeWorkOrderFieldsSettings();
        new MetadataService.FlowTranslation();
        new MetadataService.WaveRecipe();
        new MetadataService.EmailServicesAddress();
        new MetadataService.ProfileSessionSetting();
        new MetadataService.DashboardComponentColumn();
        new MetadataService.FlowStage();
        new MetadataService.CustomNotificationType();
        new MetadataService.AssistantRecommendationType();
        new MetadataService.RecommendationStrategy();
        new MetadataService.AppActionOverride();
        new MetadataService.RoleAndSubordinates();
        new MetadataService.EmbeddedServiceBranding();
        new MetadataService.ProfilePasswordPolicy();
        new MetadataService.RecommendationAudienceDetail();
        new MetadataService.FieldServiceSettings();
        new MetadataService.EclairMap();
        new MetadataService.AppProfileActionOverride();
        new MetadataService.FlowScreenFieldOutputParameter();
        new MetadataService.CommunityTemplateDefinition();
        new MetadataService.RecommendationDefinitionDetail();
        new MetadataService.FlowInputValidationRuleTranslation();
        new MetadataService.CleanRule();
        new MetadataService.EclairGeoData();
        new MetadataService.CommunityCustomThemeLayoutType();
        new MetadataService.CommunityTemplatePageSetting();
        new MetadataService.WaveXmdMeasure();
        new MetadataService.PermissionSetGroup();
        new MetadataService.TopicsForObjects();
        new MetadataService.FlowChoiceUserInputTranslation();
        new MetadataService.DashboardComponentSortInfo();   
        
        Test.stopTest();        
    }
```