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.set.is-disjoint-from.js

@@ -0,0 +1,14 @@
+'use strict';
+var $ = require('../internals/export');
+var call = require('../internals/function-call');
+var toSetLike = require('../internals/to-set-like');
+var $isDisjointFrom = require('../internals/set-is-disjoint-from');
+
+// `Set.prototype.isDisjointFrom` method
+// https://github.com/tc39/proposal-set-methods
+// TODO: Obsolete version, remove from `core-js@4`
+$({ target: 'Set', proto: true, real: true, forced: true }, {
+  isDisjointFrom: function isDisjointFrom(other) {
+    return call($isDisjointFrom, this, toSetLike(other));
+  }
+});