[Improvement] [MR] If reduce data is small, we don't need to pesist them

### Code of Conduct

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

### Search before asking

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

### What would you like to be improved?

We can refer to Spark, if reduce data is small enough, we don't need to persist them

### How should we improve?

_No response_

### Are you willing to submit PR?

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

No source file, test, threshold, or entry point is named. Start by locating the reduce-data persistence path in Uniffle and reviewing how Spark handles small reduce data. Define the behavior and boundary conditions before identifying tests that can demonstrate when data is not persisted.

Written by the indexing model from the issue text.