Search only active milestones on issues list refactor

Search only active milestones to mimic the Haml issues list
behaviour.

Also removes code in epic_token.vue that duplicates code in
base_token.vue, and makes issuable_list_root.vue not use
html5 drag and drop so we can test it with capybara

Behind feature flag `vue_issues_list` defaulted to off

app/assets/javascripts/issues/list/queries/search_milestones.query.graphql

@@ -8,6 +8,7 @@ query searchMilestones($fullPath: ID!, $search: String, $isProject: Boolean = fa
       includeAncestors: true
       includeDescendants: true
       sort: EXPIRED_LAST_DUE_DATE_ASC
+      state: active
     ) {
       nodes {
         ...Milestone
@@ -16,7 +17,12 @@ query searchMilestones($fullPath: ID!, $search: String, $isProject: Boolean = fa
   }
   project(fullPath: $fullPath) @include(if: $isProject) {
     id
-    milestones(searchTitle: $search, includeAncestors: true, sort: EXPIRED_LAST_DUE_DATE_ASC) {
+    milestones(
+      searchTitle: $search
+      includeAncestors: true
+      sort: EXPIRED_LAST_DUE_DATE_ASC
+      state: active
+    ) {
       nodes {
         ...Milestone
       }

app/assets/javascripts/vue_shared/issuable/list/components/issuable_list_root.vue

@@ -15,6 +15,7 @@ const VueDraggable = () => import('vuedraggable');
 export default {
   vueDraggableAttributes: {
     animation: 200,
+    forceFallback: true,
     ghostClass: 'gl-visibility-hidden',
     tag: 'ul',
   },

ee/app/assets/javascripts/vue_shared/components/filtered_search_bar/tokens/epic_token.vue

@@ -4,7 +4,7 @@ import createFlash from '~/flash';
 import { getIdFromGraphQLId } from '~/graphql_shared/utils';
 import { __ } from '~/locale';
 import BaseToken from '~/vue_shared/components/filtered_search_bar/tokens/base_token.vue';
-import { DEFAULT_NONE_ANY, FILTER_NONE_ANY, OPERATOR_IS_NOT } from '../constants';
+import { DEFAULT_NONE_ANY } from '../constants';
 import searchEpicsQuery from '../queries/search_epics.query.graphql';
 
 export default {
@@ -48,14 +48,6 @@ export default {
     defaultEpics() {
       return this.config.defaultEpics || DEFAULT_NONE_ANY;
     },
-    availableDefaultEpics() {
-      if (this.value.operator === OPERATOR_IS_NOT) {
-        return this.defaultEpics.filter(
-          (suggestion) => !FILTER_NONE_ANY.includes(suggestion.value),
-        );
-      }
-      return this.defaultEpics;
-    },
   },
   methods: {
     fetchEpics(search = '') {
@@ -106,7 +98,7 @@ export default {
     :suggestions-loading="loading"
     :suggestions="epics"
     :get-active-token-value="getActiveEpic"
-    :default-suggestions="availableDefaultEpics"
+    :default-suggestions="defaultEpics"
     search-by="title"
     @fetch-suggestions="fetchEpicsBySearchTerm"
     v-on="$listeners"