refactor test code

Author: suhwan-cheon

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-iceberg/src/main/java/org/apache/flink/cdc/connectors/iceberg/sink/IcebergMetadataApplier.java

@@ -183,7 +183,6 @@ private void applyCreateTable(CreateTableEvent event) {
                         catalog.createTable(
                                 tableIdentifier, icebergSchema, partitionSpec, tableOptions);
 
-                // Step3: Apply default values if any columns have them.
                 applyDefaultValues(table, cdcSchema);
 
                 LOG.info(