[Biometric Onboarding & Edu] move screen lock settings to choose lock

- Hide gear menu in LockScreenSafetySource
- Move screen lock settings to ChooseLockGeneric

Bug: 370940762
Test: atest ScreenLockPreferenceDetailsUtilsTest
Flag: com.android.settings.flags.biometrics_onboarding_education

Change-Id: I07c7bb16ecc2ea6e7cd64a4e1d6bf4f493c5b951

src/com/android/settings/security/ScreenLockPreferenceDetailsUtils.java

@@ -92,7 +92,8 @@ public class ScreenLockPreferenceDetailsUtils {
      * Returns whether the Gear Menu should be shown.
      */
     public boolean shouldShowGearMenu() {
-        return isLockPatternSecure();
+        return !com.android.settings.flags.Flags.biometricsOnboardingEducation()
+                && isLockPatternSecure();
     }
 
     /**