revert: restore original logger in CloudSchemaChangeJobV2 (keep Javadoc only)

Co-authored-by: ybtsdst <3139535+ybtsdst@users.noreply.github.com>

Author: Copilot

fe/fe-core/src/main/java/org/apache/doris/alter/CloudSchemaChangeJobV2.java

@@ -78,7 +78,7 @@
  * and clean up any partially created SchemaChangeJob records.
  */
 public class CloudSchemaChangeJobV2 extends SchemaChangeJobV2 {
-    private static final Logger LOG = LogManager.getLogger(CloudSchemaChangeJobV2.class);
+    private static final Logger LOG = LogManager.getLogger(SchemaChangeJobV2.class);
 
     /**
      * Creates a new CloudSchemaChangeJobV2 and binds it to the current compute group (cloud cluster).