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.bigint.range.js

@@ -0,0 +1,15 @@
+'use strict';
+/* eslint-disable es/no-bigint -- safe */
+var $ = require('../internals/export');
+var NumericRangeIterator = require('../internals/numeric-range-iterator');
+
+// `BigInt.range` method
+// https://github.com/tc39/proposal-Number.range
+// TODO: Remove from `core-js@4`
+if (typeof BigInt == 'function') {
+  $({ target: 'BigInt', stat: true, forced: true }, {
+    range: function range(start, end, option) {
+      return new NumericRangeIterator(start, end, option, 'bigint', BigInt(0), BigInt(1));
+    }
+  });
+}