Use redirect logging controller for Privacy Act links

[aduth]

🛠 Summary of changes

Updates Privacy Act links to use the policy redirect controller, which was updated in #11031 (RC 404) to support this link.

Follows #11031

📜 Testing Plan

1. In a separate terminal process, run make watch_events
2. Go to http://localhost:3000/
3. Click "Privacy Act Statement"
4. See "Policy Page Redirect" event in events logging with redirect_url of https://www.login.gov/policy/our-privacy-act-statement/