[Improve][API] Remove `SourceSplitEnumerator::currentUnassignedSplitSize`
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Description
### Search before asking
- [x] I had searched in the [feature](https://github.com/apache/seatunnel/issues?q=is%3Aissue+label%3A%22Feature%22) and found no similar feature requirement.
### Description
Remove `SourceSplitEnumerator::currentUnassignedSplitSize` because it only used in test case.
### Usage Scenario
_No response_
### Related issues
_No response_
### Are you willing to submit a 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)
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