SpringBoot Support multipart uploads with @RestControllerEndpoint when the management server is running on a separate port

Support multipart uploads when Spring MVC uses a different management port

Closes gh-18286

Comment From: wxl88888888

this is a good question

Comment From: bclozel

Sorry this got overlooked. We are considering deprecating such annotations entirely in #31768 so we don't expect to expand the footprint there in all cases. Thanks for your contribution!