bug(GlCollapsibleListbox,GlDisclosureDropdown): escape does not close dropdown when focus is on toggle

In GlCollapsibleListbox and GlDisclosureDropdown if the toggle button is focused and the user presses Escape the dropdown is not closed. According to https://www.w3.org/WAI/ARIA/apg/patterns/disclosure/examples/disclosure-navigation/#kbd_label it sounds like it should be closed.

In the following screenshots, pressing Escape will not close the dropdown