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/function-name.js

@@ -0,0 +1,18 @@
+'use strict';
+var DESCRIPTORS = require('../internals/descriptors');
+var hasOwn = require('../internals/has-own-property');
+
+var FunctionPrototype = Function.prototype;
+// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
+var getDescriptor = DESCRIPTORS && Object.getOwnPropertyDescriptor;
+
+var EXISTS = hasOwn(FunctionPrototype, 'name');
+// additional protection from minified / mangled / dropped function names
+var PROPER = EXISTS && (function something() { /* empty */ }).name === 'something';
+var CONFIGURABLE = EXISTS && (!DESCRIPTORS || (DESCRIPTORS && getDescriptor(FunctionPrototype, 'name').configurable));
+
+module.exports = {
+  EXISTS: EXISTS,
+  PROPER: PROPER,
+  CONFIGURABLE: CONFIGURABLE
+};