Migrate ee/app/assets/javascripts/pages/admin/application_settings/ci_cd/ci_template_dropdown.vue to GlDisclosureDropdown or GlCollapsibleListbox

One or more dropdowns in ee/app/assets/javascripts/pages/admin/application_settings/ci_cd/ci_template_dropdown.vue should be migrated to one of the new dropdown components. See the parent epic &10695 for guidance on migration strategies.