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/configurator.js

@@ -0,0 +1,28 @@
+'use strict';
+var hasOwn = require('./internals/has-own-property');
+var isArray = require('./internals/is-array');
+var isForced = require('./internals/is-forced');
+var shared = require('./internals/shared-store');
+
+var data = isForced.data;
+var normalize = isForced.normalize;
+var USE_FUNCTION_CONSTRUCTOR = 'USE_FUNCTION_CONSTRUCTOR';
+var ASYNC_ITERATOR_PROTOTYPE = 'AsyncIteratorPrototype';
+
+var setAggressivenessLevel = function (object, constant) {
+  if (isArray(object)) for (var i = 0; i < object.length; i++) data[normalize(object[i])] = constant;
+};
+
+module.exports = function (options) {
+  if (typeof options == 'object') {
+    setAggressivenessLevel(options.useNative, isForced.NATIVE);
+    setAggressivenessLevel(options.usePolyfill, isForced.POLYFILL);
+    setAggressivenessLevel(options.useFeatureDetection, null);
+    if (hasOwn(options, USE_FUNCTION_CONSTRUCTOR)) {
+      shared[USE_FUNCTION_CONSTRUCTOR] = !!options[USE_FUNCTION_CONSTRUCTOR];
+    }
+    if (hasOwn(options, ASYNC_ITERATOR_PROTOTYPE)) {
+      shared[ASYNC_ITERATOR_PROTOTYPE] = options[ASYNC_ITERATOR_PROTOTYPE];
+    }
+  }
+};