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/@babel/runtime/helpers/defineProperty.js

@@ -0,0 +1,10 @@
+var toPropertyKey = require("./toPropertyKey.js");
+function _defineProperty(e, r, t) {
+  return (r = toPropertyKey(r)) in e ? Object.defineProperty(e, r, {
+    value: t,
+    enumerable: !0,
+    configurable: !0,
+    writable: !0
+  }) : e[r] = t, e;
+}
+module.exports = _defineProperty, module.exports.__esModule = true, module.exports["default"] = module.exports;