test(functional): add step to clear the cache for browser context

packages/functional-tests/pages/login.ts

@@ -545,6 +545,7 @@ export class LoginPage extends BaseLayout {
     await this.page.goto(`${this.target.contentServerUrl}/clear`, {
       waitUntil: 'load',
     });
+    await this.page.context().clearCookies();
     return this.page.waitForTimeout(1000);
   }