[PR] HBASE-28620 Release inflight buffer when replication source terminates [hbase]

["Huginn-kio (via GitHub)" <gi...@apache.org>]

Huginn-kio opened a new pull request, #8663:
URL: https://github.com/apache/hbase/pull/8663

   ## HBASE-28620
   
   ### Summary
   
   When a replication source terminates while a WAL entry batch is in flight, its buffer quota can remain accounted indefinitely.
   
   ### Root cause
   
   `ReplicationSourceShipper.shipEdits` polls a `WALEntryBatch` from the reader queue. The buffer quota is released after successful shipping through `postShipEdits`; if the worker stops before successful shipping, the batch is no longer in the reader queue and cleanup cannot release its quota.
   
   ### Fix
   
   - Track whether the polled batch was released by successful shipping.
   - Release the batch quota after the shipping loop when it was not successfully shipped.
   - Add a regression test for a stopped shipper holding an in-flight batch.
   
   ### Testing
   
   - Targeted regression test with Maven: 1 test passed, 0 failures, 0 errors, 0 skipped.
   - Apache RAT check over the reactor: passed with 0 unapproved and 0 unknown files.
   - `git diff --check`: passed.
   
   ### Compatibility
   
   - Public API impact: none
   - Configuration impact: none
   - Persisted format impact: none
   - Wire format impact: none
   


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