minor fix for removing files

Author: alvin-r

codeflash/optimization/optimizer.py

@@ -127,8 +127,6 @@ def run(self) -> None:
                     logger.info("Information on existing benchmarks will not be available for this run.")
                 finally:
                     # Restore original source code
-                    trace_file.unlink()
-                    shutil.rmtree(self.replay_tests_dir, ignore_errors=True)
                     for file in file_path_to_source_code:
                         with file.open("w", encoding="utf8") as f:
                             f.write(file_path_to_source_code[file])