[FLINK-35277][cdc-connector][db2] Fix the error in the asncdcaddremove.sql script for the DB2 test container.

[vinlee19]

FLINK-35277
asncdcaddremove.sql
The original insert statement for ASNCDC.IBMSNAP_PRUNCNTL is as follows:

-- Original insert statement
SET stmtSQL =   'INSERT INTO ASNCDC.IBMSNAP_PRUNCNTL ( ' || 
                'TARGET_SERVER,  ' || 
                'TARGET_OWNER,  ' || 
                'TARGET_TABLE,  ' || 
                'SYNCHTIME,  ' || 
                'SYNCHPOINT,  ' || 
                'SOURCE_OWNER,  ' || 
                'SOURCE_TABLE,  ' || 
                'SOURCE_VIEW_QUAL,  ' || 
                'APPLY_QUAL,  ' || 
                'SET_NAME,  ' || 
                'CNTL_SERVER ,  ' || 
                'TARGET_STRUCTURE ,  ' || 
                'CNTL_ALIAS ,  ' || 
                'PHYS_CHANGE_OWNER ,  ' || 
                'PHYS_CHANGE_TABLE ,  ' || 
                'MAP_ID  ' || 
                ') VALUES ( ' || 
                '''KAFKA'', ' || 
                '''' || tableschema || ''', ' || 
                '''' || tablename || ''', ' ||
                'NULL, ' || 
                'NULL, ' || 
                '''' || tableschema || ''', ' || 
                '''' || tablename || ''', ' ||
                '0, ' || 
                '''KAFKAQUAL'', ' || 
                '''SET001'', ' || 
                ' (Select CURRENT_SERVER from sysibm.sysdummy1 ), ' || 
                '8, ' || 
                ' (Select CURRENT_SERVER from sysibm.sysdummy1 ), ' || 
                '''ASNCDC'', ' || 
                '''CDC_' ||  tableschema ||  '_' || tablename || ''', ' ||
                ' ( SELECT CASE WHEN max(CAST(MAP_ID AS INT)) IS NULL THEN CAST(1 AS VARCHAR(10)) ELSE CAST(CAST(max(MAP_ID) AS INT) + 1 AS VARCHAR(10))  END AS MYINT from  ASNCDC.IBMSNAP_PRUNCNTL ) ' || 
                '    )';
EXECUTE IMMEDIATE stmtSQL;

The max(MAP_ID) logic is incorrect, as the correct result should be CAST(max(CAST(MAP_ID AS INT)) + 1 AS VARCHAR(10)). This issue prevents the addition of the eleventh table. For more details about asncdcaddremove.sql, please refer to: [asncdcaddremove.sql](https://github.com/debezium/debezium-examples/blob/main/tutorial/debezium-db2-init/db2server/asncdcaddremove.sql#L189).

[vinlee19]

@ruanhang1993 @gong PTAL

[gong]

LGTM