RickyMa

[SPARK-48663][CORE] Use a double-check locking mechanism to minimize synchronization overhead in NettyUtils

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### What changes were proposed in this pull request? Use a double-check locking mechanism to minimize synchronization overhead in `NettyUtils` when calling `getSharedPooledByteBufAllocator`. ### Why are the changes needed? The...

[Improvement] Enhance Netty test coverage

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[Improvement] Unit tests support mocking the ShuffleServerNettyHandler class

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### 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...

### 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...

### 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...

### 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...

[Bug] ConcurrentModificationException is thrown when calling Roaring64NavigableMap.getLongCardinality

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[Flaky Test] Flaky test for RSSStageDynamicServerReWriteTest

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[FEATURE] A more thorough data cleaning mechanism

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[Bug] A more elegant way to delete files is needed

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### 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...