chore: remove dead code. Closes #4985

lua/lazyvim/util/cmp.lua

@@ -100,20 +100,6 @@ function M.add_missing_snippet_docs(window)
   end
 end
 
-function M.visible()
-  ---@module 'blink.cmp'
-  local blink = package.loaded["blink.cmp"]
-  if blink then
-    return blink.windows and blink.windows.autocomplete.win:is_open()
-  end
-  ---@module 'cmp'
-  local cmp = package.loaded["cmp"]
-  if cmp then
-    return cmp.core.view:visible()
-  end
-  return false
-end
-
 -- This is a better implementation of `cmp.confirm`:
 --  * check if the completion menu is visible without waiting for running sources
 --  * create an undo point before confirming