chore(site): enable react-query cache (#10943)

site/src/App.tsx

@@ -15,13 +15,17 @@ import {
 } from "@mui/material/styles";
 import { ThemeProvider as EmotionThemeProvider } from "@emotion/react";
 
+const shouldEnableCache =
+  window.location.hostname.includes("dev.coder.com") ||
+  process.env.NODE_ENV === "development";
+
 const defaultQueryClient = new QueryClient({
   defaultOptions: {
     queries: {
       retry: false,
-      cacheTime: 0,
       refetchOnWindowFocus: false,
-      networkMode: "offlineFirst",
+      cacheTime: shouldEnableCache ? undefined : 0,
+      networkMode: shouldEnableCache ? undefined : "offlineFirst",
     },
   },
 });