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/lib/shared/directives.js

@@ -0,0 +1,15 @@
+/**
+ * @fileoverview Common utils for directives.
+ *
+ * This file contains only shared items for directives.
+ * If you make a utility for rules, please see `../rules/utils/ast-utils.js`.
+ *
+ * @author gfyoung <https://github.com/gfyoung>
+ */
+"use strict";
+
+const directivesPattern = /^(eslint(?:-env|-enable|-disable(?:(?:-next)?-line)?)?|exported|globals?)(?:\s|$)/u;
+
+module.exports = {
+    directivesPattern
+};