[log](regression)Add log to investigate SLEEP command error. (apache#48385)

Add log to investigate SLEEP command error in insert_p2 cases.

Author: Jibing-Li

regression-test/framework/src/main/groovy/org/apache/doris/regression/suite/Suite.groovy

@@ -444,8 +444,10 @@ class Suite implements GroovyInterceptable {
 
     List<List<Object>> insert_into_sql(String sqlStr, int num) {
         if (context.useArrowFlightSql()) {
+            logger.info("Use arrow flight sql")
             return arrow_flight_insert_into_sql(sqlStr, num)
         } else {
+            logger.info("Use jdbc insert into")
             return jdbc_insert_into_sql(sqlStr, num)
         }
     }

regression-test/suites/insert_p2/test_group_commit_insert_into_lineitem_normal.groovy

@@ -109,6 +109,7 @@ PROPERTIES (
                 break
             } catch (Exception e) {
                 logger.info("got exception:" + e)
+                logger.info("sql: " + exp_str)
                 Thread.sleep(5000)
                 context.reconnectFe()
                 sql """ set group_commit = async_mode; """