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/core-js/internals/well-known-symbol-define.js

@@ -0,0 +1,12 @@
+'use strict';
+var path = require('../internals/path');
+var hasOwn = require('../internals/has-own-property');
+var wrappedWellKnownSymbolModule = require('../internals/well-known-symbol-wrapped');
+var defineProperty = require('../internals/object-define-property').f;
+
+module.exports = function (NAME) {
+  var Symbol = path.Symbol || (path.Symbol = {});
+  if (!hasOwn(Symbol, NAME)) defineProperty(Symbol, NAME, {
+    value: wrappedWellKnownSymbolModule.f(NAME)
+  });
+};