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/jsonl/Stringer.js

@@ -0,0 +1,29 @@
+'use strict';
+
+const {Transform} = require('stream');
+
+class JsonlStringer extends Transform {
+  static make(options) {
+    return new JsonlStringer(options);
+  }
+
+  constructor(options) {
+    super(Object.assign({}, options, {writableObjectMode: true, readableObjectMode: false}));
+    this._replacer = options && options.replacer;
+  }
+
+  _transform(chunk, _, callback) {
+    this.push(JSON.stringify(chunk, this._replacer));
+    this._transform = this._nextTransform;
+    callback(null);
+  }
+
+  _nextTransform(chunk, _, callback) {
+    this.push('\n' + JSON.stringify(chunk, this._replacer));
+    callback(null);
+  }
+}
+JsonlStringer.stringer = JsonlStringer.make;
+JsonlStringer.make.Constructor = JsonlStringer;
+
+module.exports = JsonlStringer;