Fix 4XX errors incorrectly categorized as 5XX in PDF splitting

Author: CyMule

src/unstructured_client/_hooks/custom/split_pdf_hook.py

@@ -669,11 +669,8 @@ def after_success(
         elements = self._await_elements(operation_id)
 
         # if fails are disallowed, return the first failed response
-        # Note(austin): Stick a 500 status code in here so the SDK
-        # does not trigger its own retry logic
         if not self.allow_failed and self.api_failed_responses.get(operation_id):
             failure_response = self.api_failed_responses[operation_id][0]
-            failure_response.status_code = 500
 
             self._clear_operation(operation_id)
             return failure_response