Rossen Stoyanchev 4e1c0c6826 @MessageExceptionHandler supports error signal ...

Before this change if a controller method returned a Publisher whose
first signal was an error, the error signal would not be delegated to
a @MessageExceptionHandler method as expected.

To make this work for now we use a package private local copy of the
ChannelSendOperator from spring-web.

See gh-21987

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..

main/java/org/springframework/messaging

@MessageExceptionHandler supports error signal

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test

@MessageExceptionHandler supports error signal

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