Rewrite test harness (#1487)

* switch to playwright/test

* update package-lock

* wip

* fix composition

* fix history

* fix tables

* fix character limit

* fix File and Selection tests

* update npm scripts

* fix plain text tests

* fix Keywords plain text

* skip selection test

* fix collab bug

* wait for iframe

* fix package-lock

* fix rebase issue

* fix initialization

* fix char overflow

* fix video uploads and other cleanup

* forbid only

* fix forbid only

* disable tracing

* add comment

* fix regression tests

* address comments

playwright.config.js

@@ -0,0 +1,30 @@
+'use strict';
+const {devices} = require('@playwright/test');
+
+const config = {
+  forbidOnly: !!process.env.CI,
+  projects: [
+    {
+      name: 'chromium',
+      testDir: './packages/lexical-playground/__tests__/',
+      use: {...devices['Desktop Chrome']},
+    },
+    {
+      name: 'firefox',
+      testDir: './packages/lexical-playground/__tests__/',
+      use: {...devices['Desktop Firefox']},
+    },
+    {
+      name: 'webkit',
+      testDir: './packages/lexical-playground/__tests__/',
+      use: {...devices['Desktop Safari']},
+    },
+  ],
+  retries: 5,
+  use: {
+    // this causes issues in the CI on on current version.
+    //trace: 'retain-on-failure',
+    video: 'on-first-retry',
+  },
+};
+module.exports = config;