[TNL-8235] - Fix breaking code by updating the exception when load_file fails. (#27368)

Co-authored-by: SaadYousaf <saadyousaf@A006-00314.local>

common/lib/xmodule/xmodule/xml_module.py

@@ -5,9 +5,7 @@ import copy
 import json
 import logging
 import os
-import sys
 
-import six
 from lxml import etree
 from lxml.etree import Element, ElementTree, XMLParser
 from xblock.core import XML_NAMESPACES
@@ -213,9 +211,7 @@ class XmlParserMixin:
                 return cls.file_to_xml(xml_file)
         except Exception as err:  # lint-amnesty, pylint: disable=broad-except
             # Add info about where we are, but keep the traceback
-            msg = 'Unable to load file contents at path {} for item {}: {} '.format(
-                filepath, def_id, err)
-            six.reraise(Exception, msg, sys.exc_info()[2])
+            raise Exception(f'Unable to load file contents at path {filepath} for item {def_id}: {err}') from err
 
     @classmethod
     def load_definition(cls, xml_object, system, def_id, id_generator):