[Biometric Onboarding & Edu] Update Set up Fingerprint/Face Unlock page

Update icons, strings and layouts for new UX design

Bug: 370940762
Test: manual:
      Pre condition - no fingerprint/face enrolled
      For FP: Go Settings>Security & privacy>Device unlock>Fingerprint unlock
      For Face: Go Settings>Security & privacy>Device unlock>Face unlock
Test: atest FaceEnrollIntroductionTest
Flag: com.android.settings.flags.biometrics_onboarding_education
Change-Id: Iaee6792d1a27be8fa4b443f783a47a3715b6d3a1