feat(configmanager): register Regex transformer in TransformerFactory

Add Regex to:
- Create() factory method
- CreateNew() factory method
- AvailableTypes list

NEW/src/Utils/JdeScoping.ConfigManager/ViewModels/PipelineSteps/TransformerStepViewModels.cs

@@ -566,6 +566,7 @@ public static class TransformerFactory
             "columndrop" => new ColumnDropTransformerViewModel(model, onChanged),
             "columnrename" => new ColumnRenameTransformerViewModel(model, onChanged),
             "jdedate" => new JdeDateTransformerViewModel(model, onChanged),
+            "regex" => new RegexTransformerViewModel(model, onChanged),
             _ => null // Unknown transformer type
         };
     }
@@ -580,6 +581,7 @@ public static class TransformerFactory
             "columndrop" => new ColumnDropTransformerViewModel(onChanged),
             "columnrename" => new ColumnRenameTransformerViewModel(onChanged),
             "jdedate" => new JdeDateTransformerViewModel(onChanged),
+            "regex" => new RegexTransformerViewModel(onChanged),
             _ => null
         };
     }
@@ -587,5 +589,5 @@ public static class TransformerFactory
     /// <summary>
     /// Gets the list of available transformer type names.
     /// </summary>
-    public static IReadOnlyList<string> AvailableTypes => ["ColumnDrop", "ColumnRename", "JdeDate"];
+    public static IReadOnlyList<string> AvailableTypes => ["ColumnDrop", "ColumnRename", "JdeDate", "Regex"];
 }