Reset labels select search text on Enter

The labels select Vue component did not match the previous
functionality where pressing Enter after selecting a label
in the dropdown clears the search text.

app/assets/javascripts/vue_shared/components/sidebar/labels_select_vue/dropdown_contents_labels_view.vue

@@ -112,6 +112,7 @@ export default {
         this.currentHighlightItem += 1;
       } else if (e.keyCode === ENTER_KEY_CODE && this.currentHighlightItem > -1) {
         this.updateSelectedLabels([this.visibleLabels[this.currentHighlightItem]]);
+        this.searchKey = '';
       } else if (e.keyCode === ESC_KEY_CODE) {
         this.toggleDropdownContents();
       }

changelogs/unreleased/cngo-clear-label-select-on-enter.yml

+---
+title: Reset labels select search text on Enter
+merge_request: 43285
+author:
+type: fixed

spec/frontend/vue_shared/components/sidebar/labels_select_vue/dropdown_contents_labels_view_spec.js

@@ -133,6 +133,19 @@ describe('DropdownContentsLabelsView', () => {
         expect(wrapper.vm.currentHighlightItem).toBe(2);
       });
 
+      it('resets the search text when the Enter key is pressed', () => {
+        wrapper.setData({
+          currentHighlightItem: 1,
+          searchKey: 'bug',
+        });
+
+        wrapper.vm.handleKeyDown({
+          keyCode: ENTER_KEY_CODE,
+        });
+
+        expect(wrapper.vm.searchKey).toBe('');
+      });
+
       it('calls action `updateSelectedLabels` with currently highlighted label when Enter key is pressed', () => {
         jest.spyOn(wrapper.vm, 'updateSelectedLabels').mockImplementation();
         wrapper.setData({