[Bugfix][Starrocks] Fix starrocks batch data exceeds the maximum limit

[hailin0]

Purpose of this pull request

Does this PR introduce any user-facing change?

How was this patch tested?

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config
• Update the release-note.

[Copilot]

Pull Request Overview

This PR fixes an issue where the starrocks batch data can exceed the maximum allowed limit by introducing validations in the StarRocksStreamLoadVisitor. Key changes include:

• Adding tests to verify that exceptions are thrown when batch values exceed limits for both CSV and JSON formats.
• Introducing a dedicated checkBatchMaxBytes method in StarRocksStreamLoadVisitor to validate batch sizes.
• Adjusting the joinRows method to utilize the updated batch byte validations.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
seatunnel-connectors-v2/connector-starrocks/src/test/java/org/apache/seatunnel/connectors/seatunnel/starrocks/client/StarRocksStreamLoadVisitorTest.java	Added tests to confirm proper exception behavior based on batch limits and formats.
seatunnel-connectors-v2/connector-starrocks/src/main/java/org/apache/seatunnel/connectors/seatunnel/starrocks/client/StarRocksStreamLoadVisitor.java	Updated batch validation logic and modified joinRows to use long for total bytes with proper checks.

Comments suppressed due to low confidence (2)

seatunnel-connectors-v2/connector-starrocks/src/main/java/org/apache/seatunnel/connectors/seatunnel/starrocks/client/StarRocksStreamLoadVisitor.java:329

• [nitpick] Consider merging the string concatenation into a single string literal to improve the clarity of the error message.

            + "please reset the batch_max_bytes.",

seatunnel-connectors-v2/connector-starrocks/src/main/java/org/apache/seatunnel/connectors/seatunnel/starrocks/client/StarRocksStreamLoadVisitor.java:154

• [nitpick] Consider renaming the parameter 'totalBytes' to a more descriptive name like 'cumulativeBytes' to clearly indicate that it represents the total size of all rows.

private byte[] joinRows(List<byte[]> rows, Long totalBytes) {