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Fixes: #3090 Issue: https://github.com/spring-cloud/spring-cloud-stream/issues/3090 Fixes issue where KafkaBinderConfiguration would add customizers after the transaction manager was already created. The KafkaMessageChannelBinder was initializing the transaction manager in the constructor before client factory customizers were added, which meant the customizers were never applied to the producer factory used by the transaction manager. - Moves transaction manager initialization from the constructor to the onInit() method - Leverages the existing InitializingBean lifecycle to ensure customizers are applied before the transaction manager is created - Adds comprehensive test coverage to verify the fix in the binder and via auto-configuration Signed-off-by: Soby Chacko <soby.chacko@broadcom.com> Resolves #3091