* Removing obsoleted code from ApiMediaQueryService.cs
* Removing obsoleted code from ApiRichTextMarkupParserTests.cs
* Removing obsoleted code from ContentCacheRefresher.cs
* Removing obsoleted code from ContentFinderByUrlAlias.cs and adjusting its tests to use the new logic
* Removing obsoleted code from ContentFinderByUrl.cs & its dependencies
* Removing obsoleted code from ApiRichTextMarkupParserTests.cs
* Removing obsoleted code from DocumentCache.cs & its dependencies
* Removing obsoleted code from MediaCache.cs & its dependencies
* Removing obsoleted code from PublishedCacheBase.cs & its dependencies
* Removing obsoleted code from RenderNoContentController.cs and its tests
* Removing obsoleted code from UmbracoRouteValueTransformer.cs
* Removing obsoleted constructors from DefaultUrlProvider.cs
* Removing accidental bookmark
* Introducing a helper method to get the root keys in ApiMediaQueryService.cs
* Removing obsoleted code from Cache classes
* Removing unused imports
* Refactoring to meet the CR
* Added attribute to controller
* Fixing missing using statement
* Removing obsoleted constructor from ExternalLoginService.cs and making usages fit
* Removing obsoleted method from IContentTypeFilter.cs
* Removing obsoleted methods from IContentEditingService.cs
* Removing obosoleted code from DocumentUrlService.cs
* Removed obsoleted code from DataTypeService.cs
* Removed obsoleted code from PublishStatusService.cs
* Removing obsoleted code from the IContentPublishingService.cs and its dependencies. Also implementing a TODO in the service implementation
* Removing obsoleted code from IRelationService.cs
* Removing obsoleted code from ContentPublishingService.cs
* Removing obsoleted code from ContentEditingService.cs
* Removing obsoleted code from Constants-DataTypes.cs
* Removing obsoleted code from IAction.cs and its implementations
* Removing obsoleted code from IContentService.cs
* Removing obsoleted code from DomainUtilities.cs
* Removing obsoleted code from IIndexedEntitySearchService.cs and dependencies
* Removing obsoleted code from UrlProvider.cs
* Removing obsoleted code from AliasUrlProvider.cs
* Removing obsoleted code from ApiContentRouteBuilder.cs
* Removing obsoleted code from ApiPublishedContentCache.cs
* Removing obsoleted class TemplateQueryResult.cs
* Removing obsoleted code from ApiContentBuilder.cs
* Removing obsoleted code from HealthCheck.cs
* Removing obsoleted code from ContentTypeEditingService.cs
* Removing obsoleted code from NewDefaultUrlProvider.cs
* Removing obsoleted code from PublishedElementPropertyBase.cs
* Removing obsoleted code from WebhookRequestService.cs
* Bumping to obsolete in V18, due to usage in class that will be removed in V18
* Removing obsoleted code from PropertyValidationService.cs
* Removing obsoleted code from AddUnroutableContentWarningsWhenPublishingNotificationHandler.cs
* Removing obsoleted code from IMemberService.cs
* Removing obsoleted code from DocumentCache.cs
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