Do not allow ignoring user start nodes for system data types (#15739)

* Do not allow ignoring start nodes for system data types

* Update OpenApi.json

* Update src/Umbraco.Cms.Api.Management/Mapping/DataType/DataTypeViewModelMapDefinition.cs

Co-authored-by: Sven Geusens <geusens@gmail.com>

* Regenerate OpenApi.json

---------

Co-authored-by: Sven Geusens <geusens@gmail.com>

src/Umbraco.Cms.Api.Management/Mapping/DataType/DataTypeViewModelMapDefinition.cs

@@ -28,6 +28,7 @@ public class DataTypeViewModelMapDefinition : IMapDefinition
         target.EditorAlias = source.EditorAlias;
         target.EditorUiAlias = source.EditorUiAlias;
         target.IsDeletable = source.IsDeletableDataType();
+        target.CanIgnoreStartNodes = source.IsBuildInDataType() is false;
 
         IConfigurationEditor? configurationEditor = source.Editor?.GetConfigurationEditor();
         IDictionary<string, object> configuration = configurationEditor?.ToConfigurationEditor(source.ConfigurationData)

src/Umbraco.Cms.Api.Management/OpenApi.json

@@ -26459,6 +26459,7 @@
       },
       "DataTypeResponseModel": {
         "required": [
+          "canIgnoreStartNodes",
           "id",
           "isDeletable"
         ],
@@ -26483,6 +26484,9 @@
           },
           "isDeletable": {
             "type": "boolean"
+          },
+          "canIgnoreStartNodes": {
+            "type": "boolean"
           }
         },
         "additionalProperties": false

src/Umbraco.Cms.Api.Management/ViewModels/DataType/DataTypeResponseModel.cs

@@ -7,4 +7,6 @@ public class DataTypeResponseModel : DataTypeModelBase
     public ReferenceByIdModel? Parent { get; set; }
 
     public bool IsDeletable { get; set; }
+
+    public bool CanIgnoreStartNodes { get; set; }
 }