Use binary proto fields in staging

ts/util/isProtoBinaryEncodingEnabled.dom.ts

@@ -0,0 +1,18 @@
+// Copyright 2025 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { isTestOrMockEnvironment } from '../environment.std.js';
+import { isStagingServer } from './isStagingServer.dom.js';
+
+export function isProtoBinaryEncodingEnabled(): boolean {
+  if (isTestOrMockEnvironment()) {
+    return true;
+  }
+
+  if (isStagingServer()) {
+    return true;
+  }
+
+  // TODO: DESKTOP-8938
+  return false;
+}