New Backoffice: Published cache controller (#13034)

* Add published cache controller (endpoints for the Published Status dashboard)

* Update OpenAPI contract for published cache endpoints

* Fix OpenApi spec

Co-authored-by: Zeegaan <nge@umbraco.dk>

src/Umbraco.Cms.ManagementApi/Controllers/PublishedCache/PublishedCacheControllerBase.cs

@@ -0,0 +1,13 @@
+using Microsoft.AspNetCore.Mvc;
+using NSwag.Annotations;
+using Umbraco.New.Cms.Web.Common.Routing;
+
+namespace Umbraco.Cms.ManagementApi.Controllers.PublishedCache;
+
+[ApiVersion("1.0")]
+[ApiController]
+[BackOfficeRoute("api/v{version:apiVersion}/published-cache")]
+[OpenApiTag("PublishedCache")]
+public class PublishedCacheControllerBase : ManagementApiControllerBase
+{
+}