switch download UI from GCP to S3 (#18643)

(cherry picked from commit f83917d)

Author: Borda

.actions/assistant.py

@@ -212,7 +212,7 @@ def distribute_version(src_folder: str, ver_file: str = "version.info") -> None:
         shutil.copy2(ver_template, fpath)
 
 
-def _download_frontend(pkg_path: str):
+def _download_frontend(pkg_path: str, version: str = "v0.0.0"):
     """Downloads an archive file for a specific release of the Lightning frontend and extracts it to the correct
     directory."""
 
@@ -222,13 +222,13 @@ def _download_frontend(pkg_path: str):
 
         shutil.rmtree(frontend_dir, ignore_errors=True)
         # TODO: remove this once lightning-ui package is ready as a dependency
-        frontend_release_url = "https://storage.googleapis.com/grid-packages/lightning-ui/v0.0.0/build.tar.gz"
+        frontend_release_url = f"https://lightning-packages.s3.amazonaws.com/ui/{version}.tar.gz"
         response = urllib.request.urlopen(frontend_release_url)
 
         file = tarfile.open(fileobj=response, mode="r|gz")
         file.extractall(path=download_dir)
 
-        shutil.move(os.path.join(download_dir, "build"), frontend_dir)
+        shutil.move(download_dir, frontend_dir)
         print("The Lightning UI has successfully been downloaded!")
 
     # If installing from source without internet connection, we don't want to break the installation