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/isNativeFunction.js

@@ -0,0 +1,8 @@
+function _isNativeFunction(t) {
+  try {
+    return -1 !== Function.toString.call(t).indexOf("[native code]");
+  } catch (n) {
+    return "function" == typeof t;
+  }
+}
+module.exports = _isNativeFunction, module.exports.__esModule = true, module.exports["default"] = module.exports;