[ISSUE #10945] Align POP retry records with result batches

[Aias00]

What does this PR do?

Aligns the flattened POP consumer-record index with each fetched GetMessageResult. This keeps retry-message recoding associated with the correct result after a preceding multi-message batch.

Fixes #10945.

Test

mvn -pl broker -Dtest=PopConsumerServiceTest#popAsyncRecodeRetryMessagesAfterMultiMessageNormalResultTest test

[RockteMQ-AI]

Summary

Correct fix for POP retry record index misalignment when a multi-message batch precedes retry messages.

The original code used the loop index i to access both getGetMessageResultList() and getPopConsumerRecordList(), but these lists have different cardinalities when a single GetMessageResult contains multiple messages. The fix correctly introduces a separate popConsumerRecordIndex that advances by getMessageQueueOffset().size() per batch, aligning the record index with the actual message count.

Test coverage is thorough — the new test validates the scenario with a 2-message normal result followed by a 1-message retry result.

LGTM.

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Automated review by github-manager-bot

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.54%. Comparing base (293f588) to head (02a38f8).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #10946      +/-   ##
=============================================
- Coverage      48.62%   48.54%   -0.09%     
+ Complexity     13692    13670      -22     
=============================================
  Files           1381     1381              
  Lines         101464   101466       +2     
  Branches       13187    13187              
=============================================
- Hits           49337    49255      -82     
- Misses         46142    46202      +60     
- Partials        5985     6009      +24     

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