Ensure explicit List conversion for dataTableColumns

Updated the assignment of `dataTableColumns` to explicitly convert the result of `typeGetter.GetDataColumnsForObject` into a `List<DataTableColumn>` using `.ToList()`. This change ensures compatibility and enables list-specific operations, improving code clarity and robustness.

Author: tig

src/Microsoft.PowerShell.ConsoleGuiTools/TypeGetter.cs

@@ -393,7 +393,7 @@ public static DataTable CastObjectsToTableView(List<PSObject> psObjects, bool al
 
         // Get the columns using format view definitions
         var typeGetter = new TypeGetter();
-        var dataTableColumns = typeGetter.GetDataColumnsForObject(psObjects, allProperties);
+        List<DataTableColumn> dataTableColumns = typeGetter.GetDataColumnsForObject(psObjects, allProperties).ToList();
 
         // Convert each object to a row
         var dataTableRows = new List<DataTableRow>();