feat(extui): route to "more" window if it is open (#34190)

Problem:  An already open "more" window is the most convenient place
          to route messages to with `cfg.msg.pos == 'cmd'`. Instead we
          route to the cmdline (unless that message also exceeds
          'cmdheight').
Solution: Route to "more" window while it is open and scroll to bottom
          to show the newest message. This is more convenient and more
          efficient due to not writing to the target buffer first (which
          is done to calculate the height of the message).
          (Ensure message highlights are deleted when text is replaced.)

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