[PR] [release-0.2][runtime] Backport prune state corner cases around checkpoints [flink-agents]

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

joeyutong opened a new pull request, #649:
URL: https://github.com/apache/flink-agents/pull/649

   ## Summary
   
   - Backport #603 to `release-0.2`.
   - Track `lastCompletedSequenceNumber` instead of using the latest started sequence as the prune boundary.
   - Remove eager action-state pruning on input completion and prune only after `notifyCheckpointComplete`.
   - Keep the checkpoint-pruning regression coverage on the release branch.
   
   ## Root Cause
   
   The operator previously used the latest started sequence as the prune watermark and could also prune action state immediately after an input run finished. That boundary is not checkpoint-safe: a recovery from an earlier completed checkpoint can still need the durable action state for replay.
   
   ## Release-0.2 Note
   
   - The backport needed a small test-file adjustment on `release-0.2` so the cherry-picked regression helpers compile against the older branch state.
   
   ## Validation
   
   - `ActionExecutionOperatorTest`
   


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Re: [PR] [runtime] Fix prune state corner cases around checkpoints [flink-agents]

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

xintongsong merged PR #649:
URL: https://github.com/apache/flink-agents/pull/649


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