branch-3.1: [fix](filecache) fix observation bug in multi-BE cluster apache#59259 (apache#59346)

Cherry-picked from apache#59259

Co-authored-by: zhengyu <zhangzhengyu@selectdb.com>

Author: github-actions[bot]

fe/fe-core/src/main/java/org/apache/doris/planner/BackendPartitionedSchemaScanNode.java

@@ -70,6 +70,7 @@ public class BackendPartitionedSchemaScanNode extends SchemaScanNode {
         BEACKEND_ID_COLUMN_SET.add("be_id");
 
         BACKEND_TABLE.add("file_cache_statistics");
+        BACKEND_TABLE.add("file_cache_info");
         BACKEND_TABLE.add("backend_kerberos_ticket_cache");
         BACKEND_TABLE.add("backend_tablets");
         BACKEND_TABLE.add("backend_configuration");