Throw single fetch redirects fetched from the server (#12506)

Author: brophdawg11

.changeset/dry-toes-sneeze.md

@@ -0,0 +1,5 @@
+---
+"react-router": patch
+---
+
+Throw unwrapped single fetch redirect to align with pre-single fetch behavior

packages/react-router/lib/dom/ssr/single-fetch.tsx

@@ -522,7 +522,7 @@ function unwrapSingleFetchResult(result: SingleFetchResult, routeId: string) {
     if (result.replace) {
       headers["X-Remix-Replace"] = "yes";
     }
-    return redirect(result.redirect, { status: result.status, headers });
+    throw redirect(result.redirect, { status: result.status, headers });
   } else if ("data" in result) {
     return result.data;
   } else {