Use flag for calling raise hand

ts/util/isGroupCallRaiseHandEnabled.ts

@@ -0,0 +1,14 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import * as RemoteConfig from '../RemoteConfig';
+import { isProduction } from './version';
+
+export function isGroupCallRaiseHandEnabled(): boolean {
+  if (!isProduction(window.getVersion())) {
+    return true;
+  }
+
+  // In production, use the config
+  return Boolean(RemoteConfig.isEnabled('desktop.calling.raiseHand'));
+}