Refactor download function for robustness and retries

Updated the download function to use requests for robust streaming with retries and improved error handling.

Author: cccclai

backends/qualcomm/scripts/download_qnn_sdk.py

@@ -146,16 +146,12 @@ def _download_archive(url: str, archive_path: pathlib.Path) -> bool:
         logger.info("Download completed!")
 
     except Exception as e:
-        logger.exception("Error during download: %s", e)
+        logger.error("Error during download: %s", e)
         return False
 
     if archive_path.exists() and archive_path.stat().st_size == 0:
         logger.warning("Downloaded file is empty!")
         return False
-    elif not archive_path.exists():
-        logger.error("File was not downloaded!")
-        return False
-
     return True