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