feat(help-center): enable drag-and-drop category reordering (#13706)

app/javascript/dashboard/api/helpCenter/categories.js

@@ -25,6 +25,12 @@ class CategoriesAPI extends PortalsAPI {
   delete({ portalSlug, categoryId }) {
     return axios.delete(`${this.url}/${portalSlug}/categories/${categoryId}`);
   }
+
+  reorder({ portalSlug, reorderedGroup }) {
+    return axios.post(`${this.url}/${portalSlug}/categories/reorder`, {
+      positions_hash: reorderedGroup,
+    });
+  }
 }
 
 export default new CategoriesAPI();

app/javascript/dashboard/api/specs/helpCenter/categories.spec.js

@@ -8,5 +8,6 @@ describe('#BulkActionsAPI', () => {
     expect(categoriesAPI).toHaveProperty('create');
     expect(categoriesAPI).toHaveProperty('update');
     expect(categoriesAPI).toHaveProperty('delete');
+    expect(categoriesAPI).toHaveProperty('reorder');
   });
 });