Extract EE specific files/lines for app/assets/javascripts/vue_shared/components/sidebar

We have the following files containing EE specific code. We should move them to ee/

• app/assets/javascripts/vue_shared/components/sidebar/collapsed_calendar_icon.vue
• app/assets/javascripts/vue_shared/components/sidebar/collapsed_grouped_date_picker.vue
• app/assets/javascripts/vue_shared/components/sidebar/date_picker.vue
• app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_collapsed.vue