Migrate ee/app/assets/javascripts/external_issues_show/components/sidebar/issue_field_dropdown.vue to GlDisclosureDropdown or GlCollapsibleListbox
One or more dropdowns in ee/app/assets/javascripts/external_issues_show/components/sidebar/issue_field_dropdown.vue should be migrated to one of the new dropdown components. See the parent epic &10695 for guidance on migration strategies.