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/metro-cache-key/src/index.js.flow

@@ -0,0 +1,22 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ * @oncall react_native
+ */
+
+import crypto from 'crypto';
+import fs from 'fs';
+
+export function getCacheKey(files: ReadonlyArray<string>): string {
+  return files
+    .reduce(
+      (hash, file) => hash.update('\0', 'utf8').update(fs.readFileSync(file)),
+      crypto.createHash('md5'),
+    )
+    .digest('hex');
+}