squash: use shift instead of concat for faster and more idiomatic inserts

Author: arielvalentin

helpers/sql-processor/lib/opentelemetry/helpers/sql_processor/commenter.rb

@@ -46,7 +46,7 @@ def set(carrier, headers)
             comment = "/*#{comment_parts.join(',')}*/"
 
             # Append to end of query (spec recommendation)
-            carrier.concat(" #{comment}")
+            carrier << " #{comment}"
           end
         end