fix: specify artifact_id to replace explicitly. (#6361)

This change should fix the issue that 4 artifacts are mapped to service "bigstore".

Author: zhumin8

.kokoro/nightly/create-versions-csv.sh

@@ -38,9 +38,12 @@ cat libraries.txt | while read line; do
   new_group_id="${group_id//.//}"
   service_name=${artifact_id#*-cloud-}
 
-  if [[ "${artifact_id}" == *storage* ]]; then
+  if [[ "${artifact_id}" == google-cloud-storage ]]; then
     service_name=bigstore
   fi
+  if [[ "${artifact_id}" == google-cloud-storage-transfer ]]; then
+    service_name=storagetransfer
+  fi
 
   URL=https://repo1.maven.org/maven2/$new_group_id/$artifact_id