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/stable/dom-collections/for-each.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/web.dom-collections.for-each');
+
+var parent = require('../../internals/array-for-each');
+
+module.exports = parent;

node_modules/core-js/stable/dom-collections/index.js

@@ -0,0 +1,14 @@
+'use strict';
+require('../../modules/es.object.to-string');
+require('../../modules/web.dom-collections.for-each');
+require('../../modules/web.dom-collections.iterator');
+var ArrayIterators = require('../../modules/es.array.iterator');
+var forEach = require('../../internals/array-for-each');
+
+module.exports = {
+  keys: ArrayIterators.keys,
+  values: ArrayIterators.values,
+  entries: ArrayIterators.entries,
+  iterator: ArrayIterators.values,
+  forEach: forEach
+};

node_modules/core-js/stable/dom-collections/iterator.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/es.object.to-string');
+require('../../modules/web.dom-collections.iterator');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('Array', 'values');