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/actual/weak-map/get-or-insert-computed.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/es.weak-map');
+require('../../modules/esnext.weak-map.get-or-insert-computed');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('WeakMap', 'getOrInsertComputed');

node_modules/core-js/actual/weak-map/get-or-insert.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/es.weak-map');
+require('../../modules/esnext.weak-map.get-or-insert');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('WeakMap', 'getOrInsert');

node_modules/core-js/actual/weak-map/index.js

@@ -0,0 +1,6 @@
+'use strict';
+var parent = require('../../stable/weak-map');
+require('../../modules/esnext.weak-map.get-or-insert');
+require('../../modules/esnext.weak-map.get-or-insert-computed');
+
+module.exports = parent;