refactor(tui): use nvim_echo() for verbose terminfo

This is needed for #18375 for the obvious reasons.
note: verbose_terminfo_event is only temporarily needed
until the full TUI process refactor is merged.

src/nvim/options.lua

@@ -2690,7 +2690,7 @@ return {
       full_name='verbose', abbreviation='vbs',
       short_desc=N_("give informative messages"),
       type='number', scope={'global'},
-      varname='p_verbose',
+      varname='p_verbose', redraw={'ui_option'},
       defaults={if_true=0}
     },
     {