remove asc files handling (#21217)

Signed-off-by: wang yan <[email protected]>

Author: wy65701436

tools/release/release_utils.sh

@@ -10,16 +10,12 @@ function getAssets {
     local assetsPath=$6
     mkdir $assetsPath && pushd $assetsPath
     gsutil cp gs://$bucket/$branch/$offlinePackage .
-    gsutil cp gs://$bucket/$branch/$offlinePackage.asc .
     md5sum $offlinePackage > md5sum
-    md5sum $offlinePackage.asc >> md5sum
     # Pre-release does not handle online installer packages
     if [ $prerelease = "false" ]
     then
         gsutil cp gs://$bucket/$branch/$onlinePackage .
-        gsutil cp gs://$bucket/$branch/$onlinePackage.asc .
         md5sum $onlinePackage >> md5sum
-        md5sum $onlinePackage.asc >> md5sum
     fi
     popd
 }