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/eslint/messages/shared.js

@@ -0,0 +1,18 @@
+/**
+ * @fileoverview Shared utilities for error messages.
+ * @author Josh Goldberg
+ */
+
+"use strict";
+
+/**
+ * Converts a value to a string that may be printed in errors.
+ * @param {any} value The invalid value.
+ * @param {number} indentation How many spaces to indent
+ * @returns {string} The value, stringified.
+ */
+function stringifyValueForError(value, indentation) {
+    return value ? JSON.stringify(value, null, 4).replace(/\n/gu, `\n${" ".repeat(indentation)}`) : `${value}`;
+}
+
+module.exports = { stringifyValueForError };