fix: update durable execution stop test for new behavior (#8906)

Author: reedham-aws

tests/integration/local/execution/test_execution.py

@@ -63,12 +63,8 @@ def test_execution_stop_already_completed(self):
         # Try to stop already completed execution
         stop_command = [self.cmd, "local", "execution", "stop", execution_arn]
         result = run_command(stop_command)
-        stderr_str = result.stderr.decode("utf-8") if isinstance(result.stderr, bytes) else result.stderr
-        stderr_str = stderr_str.replace("\r\n", "\n")
 
-        self.assertNotEqual(result.process.returncode, 0)
-        expected_message = f"Error: An error occurred (409) when calling the StopDurableExecution operation: Execution {execution_arn} is already completed\n"
-        self.assertEqual(stderr_str, expected_message)
+        self.assertEqual(result.process.returncode, 0)
 
     @pytest.mark.tier1_extra
     def test_tier1_execution(self):