Closes #23744 Release Notes: - Changed the `always_show_close_button` key to `show_close_button` and introduced a new `hidden` value, that allows never displaying the close button. --------- Co-authored-by: Peter Tripp <peter@zed.dev> Co-authored-by: Danilo Leal <daniloleal09@gmail.com> Co-authored-by: smit <0xtimsb@gmail.com>