cherry-pick feat(sink): limit StarRocks stream load batch size (#25750) to branch release-3.0

[risingwave-ci]

Cherry picking #25750 onto branch release-3.0,

This PR/issue was created by cherry-pick action from commit e29a68a.,

[rw-jarvis-bot]

Cherry-pick to release-3.0 is already completed and merged via #26307. Closing this tracking issue.