[portal][feat] allow customization of login redirect

apps/portal/src/components/shared/loginPageHref.ts

@@ -1,8 +1,11 @@
-export default function loginPageHref() {
+export default function loginPageHref(redirectUrl?: string) {
   return {
     pathname: '/login',
     query: {
-      redirect: typeof window !== 'undefined' ? window.location.href : null,
+      redirect:
+        typeof window !== 'undefined'
+          ? redirectUrl ?? window.location.href
+          : null,
     },
   };
 }