[Bug] Remove handlers when purging app shuffleIds

### 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 bug

In current codebase, the write/read handlers are not removed when purging shuffleIds.

### Affects Version(s)

master

### Uniffle Server Log Output

_No response_

### Uniffle Engine Log Output

_No response_

### Uniffle Server Configurations

_No response_

### Uniffle Engine Configurations

_No response_

### Additional context

_No response_

### Are you willing to submit PR?

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

Start by tracing the server code path that purges shuffleIds and inspect how its write/read handlers are registered and removed. Reproduce or add focused coverage for purging, then verify that handlers associated with purged shuffleIds no longer remain while unrelated handlers continue to work.

Written by the indexing model from the issue text.