chore: update get origin for tests (#5453)

* update origin for test

* move import

Author: timarney

lib/origin.ts

@@ -1,9 +1,13 @@
-import { headers } from "next/headers";
-
 /**
  * Extract the origin from the request's headers.
  */
 export async function getOrigin(): Promise<string> {
+  if (process.env.APP_ENV === "test") {
+    return "https://test.forms-formulaires.canada.ca";
+  }
+
+  const { headers } = await import("next/headers");
+
   const h = await headers();
 
   const detectedHost = h.get("host");