[improvement](jdbc catalog)Adjustment to JDBC External Table Configuration Based on Internal Table Settings (#25059)

This pull request addresses the behavior of the `lower_case_table_names` parameter for jdbc catalog's based on the configuration of the internal table's corresponding parameter.

Changes:
- For internal tables, if `lower_case_table_names` is set to 1 or 2, thejdbc catalog's parameter is forcefully set to `true`.
- For internal tables, if `lower_case_table_names` is set to 0, the jdbc catalog's parameter can be either `true` or `false` with a default value of `false`.

These adjustments ensure consistency and predictability when working with both internal and external table configurations in Doris.

fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/JdbcExternalCatalog.java

@@ -19,6 +19,7 @@ package org.apache.doris.datasource.jdbc;
 
 import org.apache.doris.catalog.JdbcResource;
 import org.apache.doris.catalog.external.JdbcExternalDatabase;
+import org.apache.doris.common.Config;
 import org.apache.doris.common.DdlException;
 import org.apache.doris.datasource.CatalogProperty;
 import org.apache.doris.datasource.ExternalCatalog;
@@ -125,6 +126,12 @@ public class JdbcExternalCatalog extends ExternalCatalog {
     }
 
     public String getLowerCaseTableNames() {
+        // Forced to true if Config.lower_case_table_names has a value of 1 or 2
+        if (Config.lower_case_table_names == 1 || Config.lower_case_table_names == 2) {
+            return "true";
+        }
+
+        // Otherwise, it defaults to false
         return catalogProperty.getOrDefault(JdbcResource.LOWER_CASE_TABLE_NAMES, "false");
     }