fix: poll publish results from all producers in SolaceIO writer

[waterWang]

Description

The UnboundedSolaceWriter.publishResults() method only polls the publish results queue for the current bundle's producer. When multiple producers are configured (producersMapCardinality > 1), messages published by other producers have their publish results left in their respective queues, never drained or output. This causes downstream transforms attached to the SolaceIO.Write output to receive only a subset of publish results.

Root Cause

In publishResults():

Queue<PublishResult> publishResultsQueue =
    solaceSessionServiceWithProducer().getPublishedResultsQueue();

solaceSessionServiceWithProducer() returns the session for currentBundleProducerIndex (set at @StartBundle time). Other producers' queues are never polled.

Fix

Iterate over all producers (0 to producersMapCardinality - 1) and poll each one's publish results queue. This ensures all publish results are drained and output, regardless of which producer published the message.

Related Issues

Fixes #39588
Also related to #39589 (batch pipeline output loss in SolaceIO writer).

CC @stankiewicz @iht

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