[I] [Improvement] Make timed-out rebalance tasks recoverable [fluss]

["swuferhong (via GitHub)" <gi...@apache.org>]

swuferhong opened a new issue, #3859:
URL: https://github.com/apache/fluss/issues/3859

   ### Search before asking
   
   - [x] I searched in the [issues](https://github.com/apache/fluss/issues) and found nothing similar.
   
   
   ### Motivation
   
   A bucket-level rebalance task currently has a timeout (#3096 ). When the timeout
   is reached, the task may be treated as finished even though the replica
   migration is still in an intermediate state.
   
   For example, a migration from:
   
   ```text
   [0, 1, 2] -> [1, 0, 3]
   ```
   
   may time out after reaching:
   
   ```text
   [0, 1, 2, 3]
   ```
   
   If the task is removed from tracking at this point, late AdjustIsr/NotifyLeaderAndIsr responses are ignored and the bucket may emain in an intermediate assignment indefinitely.
   Temporary ZooKeeper failures, RPC timeouts, network fluctuations, coordinator restarts, or TabletServer restarts can all expose this problem.
   
   ### Solution
   
   _No response_
   
   ### Anything else?
   
   _No response_
   
   ### Willingness to contribute
   
   - [x] I'm willing to submit a PR!


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