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/modules/esnext.data-view.get-uint8-clamped.js

@@ -0,0 +1,14 @@
+'use strict';
+var $ = require('../internals/export');
+var uncurryThis = require('../internals/function-uncurry-this');
+
+// eslint-disable-next-line es/no-typed-arrays -- safe
+var getUint8 = uncurryThis(DataView.prototype.getUint8);
+
+// `DataView.prototype.getUint8Clamped` method
+// https://github.com/tc39/proposal-dataview-get-set-uint8clamped
+$({ target: 'DataView', proto: true, forced: true }, {
+  getUint8Clamped: function getUint8Clamped(byteOffset) {
+    return getUint8(this, byteOffset);
+  }
+});