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/levelup/lib/common.js

@@ -0,0 +1,7 @@
+exports.getCallback = function (options, callback) {
+  return typeof options === 'function' ? options : callback
+}
+
+exports.getOptions = function (options) {
+  return typeof options === 'object' && options !== null ? options : {}
+}