[fix][client] diable chunk feature for retry/dead letter producer.

[thetumbled]

Motivation

• The subscription mode of retry topic must be shared/key-shared type, which has been clarified in [fix][client] fix retry topic with exclusive mode. #23859.
• The chunk feature of Pulsar can't work together with shared/key-shared subscription type:
  This feature is currently only supported for non-shared subscriptions and persistent topics.
  The reason accounting for this i guess is that all chunks belonging to same message must be sent to same consumer so that the consumer can ensemble them into one single giant message.

So we can't send chunked message to retry topics.

Modifications

Diable the chunked message feature for retry topic and dead letter topic.

Verifying this change

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This change is a trivial rework / code cleanup without any test coverage.

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Documentation

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Matching PR in forked repository

PR in forked repository: thetumbled#70

[BewareMyPower]

The chunk feature of Pulsar can't work together with shared/key-shared subscription type:

The document is outdated. See #16202

[thetumbled]

The chunk feature of Pulsar can't work together with shared/key-shared subscription type:

The document is outdated. See #16202

Thanks for clarification, the doc need to update.