Describe the issue
When the producer error channel is enabled and an error-handler-definition is defined for that binding, the error handler doesn't receive any error messages.

To Reproduce
Steps to reproduce the behavior:

1. Create a error handler function like:

   @Bean
   public Consumer<ErrorMessage> myErrorHandlerFnc() {
       msg -> logger.info("failed to publish message {}", msg);
   }

2. Configure any output binding as follows:

   spring.cloud.stream.bindings.<binding-name>.producer.error-channel-enabled=true
   spring.cloud.stream.bindings.<binding-name>.error-handler-definition=myErrorHandlerFnc

3. Cause the producer binding to throw an exception
4. Notice that myErrorHandlerFnc doesn't receive the error message.

Version of the framework
Spring Boot: 3.3.2
Spring Cloud: 2023.0.3

Expected behavior
myErrorHandlerFnc to receive error messages from the producer binding.

Additional context
Looking at AbstractMessageChannelBinder.registerErrorInfrastructure(
ProducerDestination destination, String bindingName), it seems like subscribeFunctionErrorHandler() needs to be called there against the producer binding's error channel.