Animate panel to transparent if profile is managed

For managed profiles, we need to show the managed device background with
the device admin color theme during credential UI. Since it's shown on
the "background" view behind the panel, we can animate/fade the biometric
view down, and slide in the credential UI on the "background" layer.

Bug: 140127687

Test: manual test with device admin
Test: atest com.android.systemui.biometrics
Change-Id: I2d0a1b4367912e4bf6ddf701ad68fc387501f048