Replace custom sorting with GlSorting component

A snapshot test was removed, since it provided almost no value.

Using GlSorting has changed the styling slightly, although not in
a harmful way: the width of the dropdown is fixed, instead of scaling
with the amount of text in the selected item.

The GlSorting component may not be fully Pajamas-compliant, and fixing
that may bring this UI back to nearly how it looked previously.

Addresses part of https://gitlab.com/gitlab-org/gitlab/-/issues/335066.

ee/app/assets/javascripts/dependencies/components/dependencies_actions.vue

 <script>
-import { GlButton, GlDropdown, GlDropdownItem, GlIcon, GlTooltipDirective } from '@gitlab/ui';
+import { GlButton, GlSorting, GlSortingItem, GlTooltipDirective } from '@gitlab/ui';
 import { mapActions, mapState } from 'vuex';
 import { __ } from '~/locale';
 import { DEPENDENCY_LIST_TYPES } from '../store/constants';
@@ -13,9 +13,8 @@ export default {
   name: 'DependenciesActions',
   components: {
     GlButton,
-    GlDropdown,
-    GlDropdownItem,
-    GlIcon,
+    GlSorting,
+    GlSortingItem,
   },
   directives: {
     GlTooltip: GlTooltipDirective,
@@ -29,6 +28,9 @@ export default {
     },
   },
   computed: {
+    isSortAscending() {
+      return this.sortOrder === SORT_ASCENDING;
+    },
     ...mapState({
       sortField(state) {
         return state[this.namespace].sortField;
@@ -43,9 +45,6 @@ export default {
     sortFieldName() {
       return this.$options.i18n.sortFields[this.sortField];
     },
-    sortOrderIcon() {
-      return this.sortOrder === SORT_ASCENDING ? 'sort-lowest' : 'sort-highest';
-    },
   },
   methods: {
     ...mapActions({
@@ -56,49 +55,41 @@ export default {
         dispatch(`${this.namespace}/toggleSortOrder`);
       },
     }),
-    isCurrentSortField(id) {
-      return id === this.sortField;
+    isCurrentSortField(field) {
+      return field === this.sortField;
     },
   },
 };
 </script>
 
 <template>
-  <div class="btn-toolbar">
-    <div class="btn-group flex-grow-1 mr-2">
-      <gl-dropdown :text="sortFieldName" class="flex-grow-1 text-center" right>
-        <gl-dropdown-item
-          v-for="(name, id) in $options.i18n.sortFields"
-          :key="id"
-          @click="setSortField(id)"
-        >
-          <span class="d-flex">
-            <gl-icon
-              class="flex-shrink-0 gl-mr-2"
-              :class="{ invisible: !isCurrentSortField(id) }"
-              name="mobile-issue-close"
-            />
-            {{ name }}
-          </span>
-        </gl-dropdown-item>
-      </gl-dropdown>
-      <gl-button
-        v-gl-tooltip
-        :title="$options.i18n.sortDirectionLabel"
-        :aria-label="$options.i18n.sortDirectionLabel"
-        class="flex-grow-0 js-sort-order"
-        @click="toggleSortOrder"
+  <div class="gl-display-flex">
+    <gl-sorting
+      :text="sortFieldName"
+      :is-ascending="isSortAscending"
+      :sort-direction-tool-tip="$options.i18n.sortDirectionLabel"
+      class="gl-flex-grow-1"
+      dropdown-class="gl-flex-grow-1"
+      sort-direction-toggle-class="gl-flex-grow-0!"
+      @sortDirectionChange="toggleSortOrder"
+    >
+      <gl-sorting-item
+        v-for="(name, field) in $options.i18n.sortFields"
+        :key="field"
+        :active="isCurrentSortField(field)"
+        @click="setSortField(field)"
       >
-        <gl-icon :name="sortOrderIcon" />
-      </gl-button>
-    </div>
+        {{ name }}
+      </gl-sorting-item>
+    </gl-sorting>
     <gl-button
       v-gl-tooltip
       :href="downloadEndpoint"
       download="dependencies.json"
       :title="s__('Dependencies|Export as JSON')"
-      class="js-download"
+      class="gl-ml-3"
       icon="export"
+      data-testid="export"
     >
       {{ __('Export') }}
     </gl-button>

ee/spec/frontend/dependencies/components/__snapshots__/dependencies_actions_spec.js.snap

-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`DependenciesActions component matches the snapshot 1`] = `
-<div
-  class="btn-toolbar"
->
-  <div
-    class="btn-group flex-grow-1 mr-2"
-  >
-    <gl-dropdown-stub
-      category="primary"
-      class="flex-grow-1 text-center"
-      headertext=""
-      hideheaderborder="true"
-      right="true"
-      size="medium"
-      text="Severity"
-      variant="default"
-    >
-      <gl-dropdown-item-stub
-        avatarurl=""
-        iconcolor=""
-        iconname=""
-        iconrightarialabel=""
-        iconrightname=""
-        secondarytext=""
-      >
-        <span
-          class="d-flex"
-        >
-          <gl-icon-stub
-            class="flex-shrink-0 gl-mr-2 invisible"
-            name="mobile-issue-close"
-            size="16"
-          />
-          
-          Component name
-        
-        </span>
-      </gl-dropdown-item-stub>
-      <gl-dropdown-item-stub
-        avatarurl=""
-        iconcolor=""
-        iconname=""
-        iconrightarialabel=""
-        iconrightname=""
-        secondarytext=""
-      >
-        <span
-          class="d-flex"
-        >
-          <gl-icon-stub
-            class="flex-shrink-0 gl-mr-2 invisible"
-            name="mobile-issue-close"
-            size="16"
-          />
-          
-          Packager
-        
-        </span>
-      </gl-dropdown-item-stub>
-      <gl-dropdown-item-stub
-        avatarurl=""
-        iconcolor=""
-        iconname=""
-        iconrightarialabel=""
-        iconrightname=""
-        secondarytext=""
-      >
-        <span
-          class="d-flex"
-        >
-          <gl-icon-stub
-            class="flex-shrink-0 gl-mr-2"
-            name="mobile-issue-close"
-            size="16"
-          />
-          
-          Severity
-        
-        </span>
-      </gl-dropdown-item-stub>
-    </gl-dropdown-stub>
-     
-    <gl-button-stub
-      aria-label="Sort direction"
-      buttontextclasses=""
-      category="primary"
-      class="flex-grow-0 js-sort-order"
-      icon=""
-      size="medium"
-      title="Sort direction"
-      variant="default"
-    >
-      <gl-icon-stub
-        name="sort-highest"
-        size="16"
-      />
-    </gl-button-stub>
-  </div>
-   
-  <gl-button-stub
-    buttontextclasses=""
-    category="primary"
-    class="js-download"
-    download="dependencies.json"
-    href="http://test.host/dependencies.json"
-    icon="export"
-    size="medium"
-    title="Export as JSON"
-    variant="default"
-  >
-    
-    Export
-  
-  </gl-button-stub>
-</div>
-`;

ee/spec/frontend/dependencies/components/dependencies_actions_spec.js

-import { GlDropdownItem } from '@gitlab/ui';
-import { shallowMount } from '@vue/test-utils';
+import { GlSorting, GlSortingItem } from '@gitlab/ui';
 import DependenciesActions from 'ee/dependencies/components/dependencies_actions.vue';
 import createStore from 'ee/dependencies/store';
 import { DEPENDENCY_LIST_TYPES } from 'ee/dependencies/store/constants';
 import { SORT_FIELDS } from 'ee/dependencies/store/modules/list/constants';
 import { TEST_HOST } from 'helpers/test_constants';
+import { shallowMountExtended } from 'helpers/vue_test_utils_helper';
 
 describe('DependenciesActions component', () => {
   let store;
@@ -15,13 +15,19 @@ describe('DependenciesActions component', () => {
     store = createStore();
     jest.spyOn(store, 'dispatch').mockImplementation();
 
-    wrapper = shallowMount(DependenciesActions, {
+    wrapper = shallowMountExtended(DependenciesActions, {
       ...options,
       store,
       propsData: { ...propsData },
+      stubs: {
+        GlSortingItem,
+      },
     });
   };
 
+  const findExportButton = () => wrapper.findByTestId('export');
+  const findSorting = () => wrapper.findComponent(GlSorting);
+
   beforeEach(() => {
     factory({
       propsData: { namespace },
@@ -34,14 +40,10 @@ describe('DependenciesActions component', () => {
     wrapper.destroy();
   });
 
-  it('matches the snapshot', () => {
-    expect(wrapper.element).toMatchSnapshot();
-  });
-
   it('dispatches the right setSortField action on clicking each item in the dropdown', () => {
-    const dropdownItems = wrapper.findAll(GlDropdownItem).wrappers;
+    const sortingItems = wrapper.findAllComponents(GlSortingItem).wrappers;
 
-    dropdownItems.forEach((item) => {
+    sortingItems.forEach((item) => {
       // trigger() does not work on stubbed/shallow mounted components
       // https://github.com/vuejs/vue-test-utils/issues/919
       item.vm.$emit('click');
@@ -55,14 +57,12 @@ describe('DependenciesActions component', () => {
   });
 
   it('dispatches the toggleSortOrder action on clicking the sort order button', () => {
-    const sortButton = wrapper.find('.js-sort-order');
-    sortButton.vm.$emit('click');
+    findSorting().vm.$emit('sortDirectionChange');
     expect(store.dispatch).toHaveBeenCalledWith(`${namespace}/toggleSortOrder`);
   });
 
   it('has a button to export the dependency list', () => {
-    const download = wrapper.find('.js-download');
-    expect(download.attributes()).toEqual(
+    expect(findExportButton().attributes()).toEqual(
       expect.objectContaining({
         href: store.getters[`${namespace}/downloadEndpoint`],
         download: expect.any(String),