Migrate `ee/app/assets/javascripts/oncall_schedules/components/rotations/components/add_edit_rotation_form.vue` to to GlDisclosureDropdown or GlCollapsibleListbox

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