[Bug] Multi-table CDC Mode Unable to synchronize field and table comments.

### Search before asking

- [x] I had searched in the [issues](https://github.com/apache/doris/issues?q=is%3Aissue) and found no similar issues.

### Version

doris 4.1.3

### What's Wrong?

CREATE JOB test
ON STREAMING
FROM MYSQL (
"jdbc_url" = "jdbc:mysql://10.201.26.13:3306?useSSL=false&useUnicode=true&tinyInt1isBit=false&characterEncoding=UTF-8&useInformationSchema=true",
"driver_url" = "mysql-connector-j-8.0.33.jar",
"driver_class" = "com.mysql.cj.jdbc.Driver",
"user" = "root",
"password" = "xxxxxx",
"database" = "juma_visualization",
"snapshot_parallelism" = "8",
"snapshot_split_size" = "100000",
"offset" = "initial"
)
TO DATABASE test (
"table.create.properties.replication_num" = "1" ,
"table.create.properties.estimate_partition_size" = "100M"
)

### What You Expected?

Unable to synchronize field and table comments.

### How to Reproduce?

_No response_

### Anything Else?

_No response_

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)

Start with the CREATE JOB ... FROM MYSQL streaming CDC configuration in the issue and reproduce it against Doris 4.1.3 using multiple source tables. Trace how field and table comments are handled during synchronization; done means both comment types are present on the created target tables and columns.

Written by the indexing model from the issue text.