Use data type configuration to determine default value for empty toggle and slider property values (#17854)

* Use data type configuration to determine default value for empty toggle property values.

* Added/updated unit tests.

* Fixed failing integration tests.

* Applied similar default value display for the slider property editor and aligned implementation of true/false with this.

* Fixed unit tests.

* Removed "duplicate" JsonPropertyName attributes and added a custom TypeInfoResolver for data type configuration so we can re-use the existing ConfigurationField attributes.

* Minor cleanup

---------

Co-authored-by: nikolajlauridsen <nikolajlauridsen@protonmail.ch>

tests/Umbraco.Tests.Common/Builders/DataTypeBuilder.cs

@@ -137,7 +137,7 @@ public class DataTypeBuilder
         var sortOrder = _sortOrder ?? 0;
         var serializer = new SystemTextConfigurationEditorJsonSerializer();
 
-        return new DataType(editor, serializer, parentId)
+        var dataType = new DataType(editor, serializer, parentId)
         {
             Id = id,
             Key = key,
@@ -152,5 +152,7 @@ public class DataTypeBuilder
             DatabaseType = databaseType,
             SortOrder = sortOrder
         };
+
+        return dataType;
     }
 }