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/es/map/group-by.js

@@ -0,0 +1,7 @@
+'use strict';
+require('../../modules/es.object.to-string');
+require('../../modules/es.map');
+require('../../modules/es.map.group-by');
+var path = require('../../internals/path');
+
+module.exports = path.Map.groupBy;

node_modules/core-js/es/map/index.js

@@ -0,0 +1,9 @@
+'use strict';
+require('../../modules/es.array.iterator');
+require('../../modules/es.map');
+require('../../modules/es.map.group-by');
+require('../../modules/es.object.to-string');
+require('../../modules/es.string.iterator');
+var path = require('../../internals/path');
+
+module.exports = path.Map;