[Flaky Test] RssShuffleTest.testSchedulerTerminatesOnException:93 expected: <false> but was: <true>

### 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.

### Describe the flaky test

RssShuffleTest.testSchedulerTerminatesOnException:93 expected: but was:

### Actions URL

https://github.com/apache/incubator-uniffle/actions/runs/5771062012

### Are you willing to submit PR?

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

Start with the referenced Actions run and inspect RssShuffleTest.testSchedulerTerminatesOnException at line 93. Reproduce the expected false but observed true result, then trace the test's termination behavior to identify the source of the flakiness. Done means the test reliably passes and still verifies the intended exception-handling behavior.

Written by the indexing model from the issue text.