fix: use import_string instead of get_storage_class to import the view class

xmodule/tabs.py

@@ -6,7 +6,7 @@ Implement CourseTab
 import logging
 from abc import ABCMeta
 
-from django.core.files.storage import get_storage_class
+from django.utils.module_loading import import_string
 from xblock.fields import List
 
 from edx_django_utils.plugins import PluginError
@@ -281,7 +281,7 @@ class TabFragmentViewMixin:
         Returns the view that will be used to render the fragment.
         """
         if not self._fragment_view:
-            self._fragment_view = get_storage_class(self.fragment_view_name)()
+            self._fragment_view = import_string(self.fragment_view_name)()
         return self._fragment_view
 
     def render_to_fragment(self, request, course, **kwargs):