Update generate_changelog.sh

Author: andreaangiolillo

.github/scripts/generate_changelog.sh

@@ -11,6 +11,8 @@ mkdir -p changelog/revision
 cp openapi/v2/openapi-*.json changelog/revision/
 
 echo "Generating revision metadata file"
+# CLOUDP-311382: This change avoid to conside upcoming for the changelog for now.
+# We will revert this change once we add support for upcoming to changelog.
 revision_version=$(< openapi/v2/versions.json jq -r '
   .[] | select(. != "preview" and (endswith(".upcoming") | not))
 ' | paste -sd ',' -)