Make Xref commands follow 'display-buffer' customizations

Make Xref commands follow 'display-buffer' customizations

* lisp/progmodes/xref.el (xref--show-pos-in-buf): Append
'(category . xref-jump)' to display-buffer action argument, when
the target window or frame is not made explicit by the command.
(xref--switch-to-buffer): New function (bug#74361).
Do the switch through 'pop-to-buffer' and use the new category.
(xref-go-back, xref-go-forward, xref-pop-to-location): Use it.
* etc/NEWS: Describe the change.

(cherry picked from commit 0624fe6f8497a677ae354da0a604dbf82e69400a)