[branch-2.1](function) fix wrong result when convert_tz is out of bound (#37358) (#38313)
## Proposed changes
pick https://github.com/apache/doris/pull/37358
before:
```sql
mysql> select CONVERT_TZ(cast('0000-01-01 00:00:00.00001' as DATETIMEV1), cast('Asia/Shanghai' as VARCHAR(65533)), cast('America/Los_Angeles' as VARCHAR(65533)));
+---------------------------------------------------------------------------------------------------------------------------------------------------+
| convert_tz(cast('0000-01-01 00:00:00.00001' as DATETIME), cast('Asia/Shanghai' as VARCHAR(65533)), cast('America/Los_Angeles' as VARCHAR(65533))) |
+---------------------------------------------------------------------------------------------------------------------------------------------------+
| q535-12-31 08:01:19 |
+---------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.12 sec)
```
now:
```sql
mysql> select CONVERT_TZ(cast('0000-01-01 00:00:00.00001' as DATETIMEV1), cast('Asia/Shanghai' as VARCHAR(65533)), cast('America/Los_Angeles' as VARCHAR(65533)));
+---------------------------------------------------------------------------------------------------------------------------------------------------+
| convert_tz(cast('0000-01-01 00:00:00.00001' as DATETIME), cast('Asia/Shanghai' as VARCHAR(65533)), cast('America/Los_Angeles' as VARCHAR(65533))) |
+---------------------------------------------------------------------------------------------------------------------------------------------------+
| NULL |
+---------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.09 sec)
```