Provide @emotion/css to plugins

Summary: Changelog: Provide `emotion/css` to plugins

Reviewed By: antonk52

Differential Revision: D40057817

fbshipit-source-id: 1e931eb8527d62dd4312556a6d493fdf3e17b45a

desktop/flipper-server-companion/src/globalsReplacements/fakeEmotionCss.tsx

@@ -0,0 +1,10 @@
+/**
+ * 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.
+ *
+ * @format
+ */
+
+export const css = () => () => ({});