Fix: [AEA-5481] - Ensure logged in users are redirected if they navigate to site/ (#1121)

## Summary

- Routine Change

### Details

Ensure logged in users are redirected if they navigate to site/. 
Cloudfront redirects work and get the user to site/, but existing
behaviour was to present page not found, change the behaviour to forward
the user to kick off the search functionality.

---------

Signed-off-by: Connor Avery <[email protected]>

Author: connoravo-nhs

.github/workflows/run_regression_tests.yml

@@ -70,11 +70,11 @@ jobs:
         run: |
               if [[ "$TARGET_ENVIRONMENT" != "prod" && "$TARGET_ENVIRONMENT" != "ref" ]]; then
                 # this should be the tag of the tests you want to run
-                REGRESSION_TEST_REPO_TAG=v3.0.0
+                REGRESSION_TEST_REPO_TAG=v3.1.0
 
                 # this should be the tag of the regression test workflow you want to run
                 # This will normally be the same as REGRESSION_TEST_REPO_TAG
-                REGRESSION_TEST_WORKFLOW_TAG=v3.0.0
+                REGRESSION_TEST_WORKFLOW_TAG=v3.1.0
 
                 curl https://raw.githubusercontent.com/NHSDigital/electronic-prescription-service-api-regression-tests/refs/tags/${REGRESSION_TEST_WORKFLOW_TAG}/scripts/run_regression_tests.py -o run_regression_tests.py
                 poetry install

packages/cpt-ui/src/App.tsx

@@ -1,5 +1,5 @@
-import {Routes, Route} from "react-router-dom"
-import {AuthProvider} from "@/context/AuthProvider"
+import {Routes, Route, Navigate} from "react-router-dom"
+import {AuthProvider, useAuth} from "@/context/AuthProvider"
 import {AccessProvider} from "@/context/AccessProvider"
 import {SearchProvider} from "@/context/SearchProvider"
 import {PatientDetailsProvider} from "./context/PatientDetailsProvider"
@@ -23,6 +23,14 @@ import PrivacyNoticePage from "./pages/PrivacyNoticePage"
 
 import {FRONTEND_PATHS} from "@/constants/environment"
 
+const RootRoute = () => {
+  const {isSignedIn} = useAuth()
+
+  return isSignedIn
+    ? <Navigate to={FRONTEND_PATHS.SEARCH_BY_PRESCRIPTION_ID} replace />
+    : <NotFoundPage />
+}
+
 export default function App() {
   return (
     <AuthProvider>
@@ -38,7 +46,7 @@ export default function App() {
                   <Route path="cookies-selected" element={<CookieSettingsPage />} />
 
                   {/* Your existing routes */}
-                  <Route index element={<NotFoundPage />} />
+                  <Route index element={<RootRoute />} />
                   <Route path="*" element={<NotFoundPage />} />
                   <Route path={FRONTEND_PATHS.LOGIN} element={<LoginPage />} />
                   <Route path={FRONTEND_PATHS.LOGOUT} element={<LogoutPage />} />