Error messages from propadd action are not returned to the client

WIth the upgrade to jetty 10 (XWIKI-18152) Response#setStatus has also been deprecated, and the message is not persisted in a reason field anymore.
See https://github.com/eclipse/jetty.project/blob/3c32afa05c5ffcf4ad77a7769a118df4e083b92d/jetty-server/src/main/java/org/eclipse/jetty/server/Response.java#L761
And https://github.com/eclipse/jetty.project/issues/3225

Consequently, error messages from propadd action are not returned to the client.