Management API model mapping take two (#15667)

* Re-modelling API models (take two)

* Do not use "content" - use "document" and "media" instead.

* Move "item" endpoints to their own silo

* Use "Id", not "Key"

* Regenerate OpenApi.json

* Rename user start node IDs from "content" to "document"

* Regererate OpenApi.json after forward merge

* update importmap

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Co-authored-by: Mads Rasmussen <madsr@hey.com>

src/Umbraco.Cms.Api.Management/ViewModels/HealthCheck/HealthCheckActionRequestModel.cs

@@ -5,7 +5,7 @@ public class HealthCheckActionRequestModel
     /// <summary>
     ///     Gets or sets the health check key.
     /// </summary>
-    public Guid HealthCheckId { get; set; }
+    public required ReferenceByIdModel HealthCheck { get; set; }
 
     /// <summary>
     ///     Gets or sets the alias.