Resolves https://github.com/spring-projects/spring-integration/issues/2958
The previous commit added the raw source message to a common header
`IntegrationMessageHeaderAccessor.SOURCE_DATA` so that the spring-cloud-stream
can construct an error message containing the data when using functions.
However, we also need to add it to the common header when the `ErrorMessage`
is created by Spring Integration for the normal message channel binder.
This allows the DLQ processing to be agnostic as to who created the
error message.
78a0ec74e7