misc: convert all internal scripts to ESM (#6286)

* misc: convert all internal scripts to ESM

* fixes

* fix

* fixes

* fix!

* complete eslint

* more move

* fix!

* This looks better?

* Final ones

packages/stylelint-copyright/__tests__/index.js

@@ -1,70 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-const path = require('path');
-const rule = require('..');
-
-const {ruleName, messages} = rule;
-
-testStylelintRule(
-  {
-    // Relative to repo root.
-    plugins: [path.join(process.cwd(), 'packages', 'stylelint-copyright')],
-    rules: {
-      [ruleName]: true,
-    },
-  },
-  {
-    ruleName,
-    fix: false,
-    accept: [
-      {
-        code: `
-/**
- * Copyright
- */
-
- .foo {}`,
-      },
-      {
-        code: `
-      /**
- * copyright
- */
-
- .foo {}`,
-      },
-    ],
-    reject: [
-      {
-        code: `
-/**
- * Copyleft
- */
-
- .foo {}`,
-        message: messages.rejected,
-        line: 2,
-        column: 1,
-      },
-      {
-        code: `
-/**
- * Copyleft
- */
-
-/**
- * Copyright
- */
- .foo {}`,
-        message: messages.rejected,
-        line: 2,
-        column: 1,
-      },
-    ],
-  },
-);