Migrate app/assets/javascripts/content_editor/components/bubble_menus/code_block_bubble_menu.vue to to GlDisclosureDropdown or GlCollapsibleListbox

One or more dropdowns in app/assets/javascripts/content_editor/components/bubble_menus/code_block_bubble_menu.vue should be migrated to one of the new dropdown components. See the parent epic for guidance on migration strategies.