Describe the bug: the embeddable isEditable function is marked async, but its usages in src/plugins/dashboard/public/application/top_nav/editor_menu.tsx and x-pack/plugins/canvas/public/components/workpad_header/editor_menu/editor_menu.tsx are not awaited. This means that potentially embeddables that the user doesn't have permission for could show up in the list.

Thanks to @brianseeders for catching this in #120812