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/stream-json/Emitter.js

@@ -0,0 +1,22 @@
+'use strict';
+
+const {Writable} = require('stream');
+
+class Emitter extends Writable {
+  static make(options) {
+    return new Emitter(options);
+  }
+
+  constructor(options) {
+    super(Object.assign({}, options, {objectMode: true}));
+  }
+
+  _write(chunk, encoding, callback) {
+    this.emit(chunk.name, chunk.value);
+    callback(null);
+  }
+}
+Emitter.emitter = Emitter.make;
+Emitter.make.Constructor = Emitter;
+
+module.exports = Emitter;