针对于达梦的批量插入，目前分布式AT模式不支持分布式事务

- [ ] I have searched the [issues](https://github.com/seata/seata/issues) of this repository and believe that this is not a duplicate.

### Ⅰ. Issue Description
针对于达梦的批量插入，目前分布式AT模式不支持分布式事务

### Ⅱ. Describe what happened

### Ⅲ. Describe what you expected to happen

### Ⅵ. Environment:

- JDK version(e.g. `java -version`):1.8
- Seata client/server version: 2.0
- Database version:dameng(达梦数据库) 7
- OS(e.g. `uname -a`): Centos
- Others:

Start by reproducing the batch-insert case described for Seata 2.0 AT mode with Dameng 7, JDK 1.8, and CentOS. The issue does not name files, tests, or entry points; a useful result would identify the failing transaction behavior and define what distributed-transaction support should look like for this case.

Written by the indexing model from the issue text.