ci: only run aio_preview job on PR builds (#26030)

There can be no preview on non-PR builds, so there is no point in
running the job.

PR Close #26030

aio/scripts/build-artifacts.sh

@@ -9,13 +9,13 @@ readonly OUTPUT_FILE=$PROJECT_ROOT/$1
 readonly PR_NUMBER=$2
 readonly PR_LAST_SHA=$3
 readonly deployedUrl=https://pr${PR_NUMBER}-${PR_LAST_SHA:0:7}.ngbuilds.io/
- 
+
 (
   cd $PROJECT_ROOT/aio
 
   # Build and store the app
   yarn build
-  
+
   # Set deployedUrl as parameter in the opensearch description
   # deployedUrl must end with /
   yarn set-opensearch-url $deployedUrl