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/full/weak-set/add-all.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/es.weak-set');
+require('../../modules/esnext.weak-set.add-all');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('WeakSet', 'addAll');

node_modules/core-js/full/weak-set/delete-all.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/es.weak-set');
+require('../../modules/esnext.weak-set.delete-all');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('WeakSet', 'deleteAll');

node_modules/core-js/full/weak-set/from.js

@@ -0,0 +1,12 @@
+'use strict';
+require('../../modules/es.object.to-string');
+require('../../modules/es.array.iterator');
+require('../../modules/es.string.iterator');
+require('../../modules/es.weak-set');
+require('../../modules/esnext.weak-set.from');
+require('../../modules/esnext.weak-set.add-all');
+require('../../modules/esnext.weak-set.delete-all');
+require('../../modules/web.dom-collections.iterator');
+var path = require('../../internals/path');
+
+module.exports = path.WeakSet.from;

node_modules/core-js/full/weak-set/index.js

@@ -0,0 +1,9 @@
+'use strict';
+var parent = require('../../actual/weak-set');
+require('../../modules/es.string.iterator');
+require('../../modules/esnext.weak-set.add-all');
+require('../../modules/esnext.weak-set.delete-all');
+require('../../modules/esnext.weak-set.from');
+require('../../modules/esnext.weak-set.of');
+
+module.exports = parent;

node_modules/core-js/full/weak-set/of.js

@@ -0,0 +1,10 @@
+'use strict';
+require('../../modules/es.object.to-string');
+require('../../modules/es.array.iterator');
+require('../../modules/es.weak-set');
+require('../../modules/esnext.weak-set.of');
+require('../../modules/esnext.weak-set.add-all');
+require('../../modules/esnext.weak-set.delete-all');
+var path = require('../../internals/path');
+
+module.exports = path.WeakSet.of;