Chore: Fix eslint errors

jest.base-config.js

@@ -1,3 +1,5 @@
+'use strict';
+
 module.exports = {
   rootDir: __dirname,
   setupFilesAfterEnv: ['<rootDir>/test/unit.setup.js'],

jest.config.api.js

@@ -1,3 +1,5 @@
+'use strict';
+
 module.exports = {
   displayName: 'API integration tests',
   testMatch: ['**/?(*.)+(spec|test).api.js'],

jest.config.front.js

@@ -1,3 +1,5 @@
+'use strict';
+
 const baseConfig = require('./jest.base-config.front');
 
 module.exports = {

packages/admin-test-utils/lib/setup/test-bundler.js

@@ -1,7 +1,7 @@
 'use strict';
 
 // See https://github.com/swc-project/swc/issues/6460
-// SWC is not able to include the core-js polyfill for 
+// SWC is not able to include the core-js polyfill for
 // array/at automatically at the moment of writing, which
 // makes some frontend tests fail on node@14.
 require('core-js/actual/array/at');