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/es.uint8-array.from-hex.js

@@ -0,0 +1,13 @@
+'use strict';
+var $ = require('../internals/export');
+var globalThis = require('../internals/global-this');
+var aString = require('../internals/a-string');
+var $fromHex = require('../internals/uint8-from-hex');
+
+// `Uint8Array.fromHex` method
+// https://github.com/tc39/proposal-arraybuffer-base64
+if (globalThis.Uint8Array) $({ target: 'Uint8Array', stat: true }, {
+  fromHex: function fromHex(string) {
+    return $fromHex(aString(string)).bytes;
+  }
+});