fix(client): use session-user endpoint on client (#66961)

client/src/utils/ajax.ts

@@ -153,7 +153,7 @@ export function getSessionUser(
   signal?: AbortSignal
 ): Promise<ResponseWithData<User | null>> {
   const responseWithData: Promise<ResponseWithData<ApiUserResponse>> = get(
-    '/user/get-session-user',
+    '/user/session-user',
     signal
   );
   // TODO: Once DB is migrated, no longer need to parse `files` -> `challengeFiles` etc.

e2e/flash.spec.ts

@@ -42,10 +42,13 @@ test.describe('Flash Message component E2E test', () => {
   });
 
   test('should be visible when a network error occurs', async ({ page }) => {
-    await page.route(
-      '*/**/user/get-session-user',
-      async route => await route.fulfill({ status: 500 })
-    );
+    await page.route('*/**/user/session-user', async route => {
+      await route.fulfill({
+        status: 500,
+        contentType: 'application/json',
+        body: JSON.stringify({ user: {}, result: '' })
+      });
+    });
 
     await page.goto('/');
     await checkFlashMessageVisibility(