Migrate app/assets/javascripts/vue_shared/components/date_time_picker/date_time_picker.vue to GlDisclosureDropdown or GlCollapsibleListbox

One or more dropdowns in app/assets/javascripts/vue_shared/components/date_time_picker/date_time_picker.vue should be migrated to one of the new dropdown components. See the parent epic &10695 for guidance on migration strategies.