Convert to flat eslint config

Author: kategengler

.eslintignore

@@ -11,6 +11,7 @@ import { createRequire } from 'node:module';
 import vmBabelPlugins from '@glimmer/vm-babel-plugins';
 import baseConfig from './babel.config.mjs';
 
+// eslint-disable-next-line no-redeclare
 const require = createRequire(import.meta.url);
 const buildDebugMacroPlugin = require('./broccoli/build-debug-macro-plugin.js');
 const isProduction = process.env.EMBER_ENV === 'production';

.eslintrc.js

@@ -1,5 +1,4 @@
 'use strict';
-/* eslint-env node */
 
 const fs = require('fs');
 const path = require('path');

babel.test.config.mjs

@@ -1,6 +1,5 @@
-/* eslint-env browser */
 /* eslint-disable no-console */
-/* globals QUnit */
+/* globals QUnit,document,window */
 'use strict';
 document.addEventListener('DOMContentLoaded', function () {
   let testsTotal = 0;