Prettify the frontend code (#8648)

* Add Prettier global configs

* Format js/jsx/ts/tsx/less files

superset/assets/spec/javascripts/CRUD/CollectionTable_spec.jsx

@@ -28,7 +28,6 @@ const props = {
 };
 
 describe('CollectionTable', () => {
-
   let wrapper;
   let el;
 
@@ -46,5 +45,4 @@ describe('CollectionTable', () => {
     expect(wrapper.find('table')).toHaveLength(1);
     expect(wrapper.find('tbody tr.row')).toHaveLength(length);
   });
-
 });