refactor: improve file handling logic in Dropbox and OneDrive connectors to include unsupported file extension information

surfsense_backend/app/connectors/dropbox/folder_manager.py

@@ -64,8 +64,10 @@ async def get_files_in_folder(
                         )
                         continue
                     files.extend(sub_files)
-            elif not should_skip_file(item):
-                files.append(item)
+            else:
+                skip, _unsup_ext = should_skip_file(item)
+                if not skip:
+                    files.append(item)
 
         return files, None