make local cypress dx great again (#46839)

frontend/src/metabase/styled-components/components/EmotionCacheProvider/EmotionCacheProvider.tsx

@@ -3,6 +3,8 @@ import { CacheProvider } from "@emotion/react";
 import type { ReactNode } from "react";
 import { useMemo } from "react";
 
+import { isCypressActive } from "metabase/env";
+
 interface EmotionCacheProviderProps {
   children?: ReactNode;
 }
@@ -11,7 +13,11 @@ export const EmotionCacheProvider = ({
   children,
 }: EmotionCacheProviderProps) => {
   const emotionCache = useMemo(() => {
-    const cache = createCache({ key: "emotion", nonce: window.MetabaseNonce });
+    const cache = createCache({
+      key: "emotion",
+      nonce: window.MetabaseNonce,
+      ...(isCypressActive && { speedy: true }),
+    });
     // This disables :first-child not working in SSR warnings
     // Source: https://github.com/emotion-js/emotion/issues/1105#issuecomment-557726922
     cache.compat = true;