[C++] UnAckedMessageTracker handles batch message incorrectly #9170
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Motivation
It is necessary to reset batchIndex of MessageId when tracking a message. Because only the ack of the last message in batch is
removed from
UnAckedMessageTrackerEnabled
Verifying this change
add test case: testBatchUnAckedMessageTracker()
Modifications
when track or untrack a message, reset batchIndex of MessageId to -1
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