[Bug][Connector-StarRocks] Fix label reuse on stream_load failure causing infinite retry and data loss

[xyueji]

Purpose of this pull request

Fix two issues in StarRocks sink connector when stream_load fails with "Label has already been used":

Bug 1 - Data loss in StarRocksSinkManager: When a stream_load fails and StarRocks retains the label, the current code detects "Label has already been used" and breaks out of the retry loop, silently skipping the entire batch. This causes data loss because the data was never actually loaded into StarRocks.

Fix: Replace break with generating a new label and continue to retry the batch with the new label.

Bug 2 - Missing reCreateLabel flag in StarRocksStreamLoadVisitor: When doStreamLoad() returns Status="Fail" with a message containing "has already been used", the thrown StarRocksConnectorException does not set reCreateLabel=true. This prevents the retry logic from generating a new label via the needReCreateLabel() path.

Fix: Detect "has already been used" in the failure message and pass reCreateLabel=true to the exception constructor.

Does this PR introduce any user-facing change?

No. This is a bug fix for an internal retry mechanism. Users will see that stream_load retries now succeed (with a new label) instead of either looping infinitely or silently losing data.

How was this patch tested?

Manually tested by reproducing the scenario where StarRocks retains a failed label. After the fix, the retry generates a new label and completes successfully without data loss.

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.