FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

node_modules/chromium-edge-launcher/compiled-check.js

@@ -0,0 +1,13 @@
+'use strict'
+
+const fs = require('fs');
+const path = require('path');
+
+module.exports = function(filename) {
+  if (!fs.existsSync(path.join(__dirname, filename))) {
+    console.log(
+        'Oops! Looks like the chromium-edge-launcher files needs to be compiled. Please run:');
+    console.log('   yarn; yarn build;');
+    process.exit(1);
+  }
+}