MM-62954 E2E/Playwright shared library (#30177)

* feat: Add package.json for Playwright library with dependencies

* feat: Add explicit exports for test.config in playwright-lib package

* feat: Add initialization setup for Mattermost E2E testing with admin and user client

* fix: Update package dependencies and resolve TypeScript build errors

* feat: Update package exports for test.config to support both CommonJS and ESM

* playwright shared library

* add README, fix pipeline

* keep file structures, move report up to playwright

* minimize API, use the prerelease versions of client and types

* bump version

* update package*.json

* resolve merge conflict

* update depedencies and merge conflicts

* update readme and fix ci

* remove unnecessary export and list all external packages

* fix import for Client4

e2e-tests/playwright/eslint.config.mjs

@@ -5,6 +5,7 @@ import path from 'node:path';
 import {fileURLToPath} from 'node:url';
 import js from '@eslint/js';
 import {FlatCompat} from '@eslint/eslintrc';
+import eslintPluginHeader from 'eslint-plugin-header';
 
 const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
@@ -14,18 +15,23 @@ const compat = new FlatCompat({
     allConfig: js.configs.all,
 });
 
+eslintPluginHeader.rules.header.meta.schema = false;
+
 export default [
     {
-        ignores: ['**/node_modules', '**/playwright-report', '**/test-results', '**/results'],
+        ignores: ['**/node_modules', '**/dist', '**/playwright-report', '**/test-results', '**/results'],
     },
-    ...compat.extends('eslint:recommended', 'plugin:@typescript-eslint/recommended').map((config) => ({
-        ...config,
-        files: ['**/*.ts', '**/*.s'],
-    })),
+    ...compat
+        .extends('eslint:recommended', 'plugin:@typescript-eslint/recommended', 'plugin:import/recommended')
+        .map((config) => ({
+            ...config,
+            files: ['**/*.ts', '**/*.js'],
+        })),
     {
-        files: ['**/*.ts', '**/*.s'],
+        files: ['**/*.ts', '**/*.js'],
         plugins: {
             '@typescript-eslint': typescriptEslint,
+            header: eslintPluginHeader,
         },
         languageOptions: {
             globals: {
@@ -35,11 +41,31 @@ export default [
             ecmaVersion: 5,
             sourceType: 'module',
         },
+        settings: {
+            'import/resolver': {
+                typescript: true,
+                node: true,
+            },
+        },
         rules: {
             '@typescript-eslint/explicit-module-boundary-types': 'off',
             '@typescript-eslint/no-explicit-any': 'off',
             '@typescript-eslint/no-var-requires': 'off',
             'no-console': 'error',
+            'header/header': [
+                'error',
+                'line',
+                ' Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.\n See LICENSE.txt for license information.',
+                2,
+            ],
+            'import/order': [
+                'error',
+                {
+                    'newlines-between': 'always',
+                    groups: ['builtin', 'external', 'internal', 'parent', 'sibling', 'index'],
+                },
+            ],
+            'import/no-unresolved': 'off',
         },
     },
 ];