Fix rotating brand view animation

[davidme-stripe]

Summary

I don't think UIView.transition was intended to be used within a UIViewPropertyAnimator. We'll recreate this transition on our own by cross-fading between two UIImageViews.

Motivation

Inexplicably, this animation was breaking the background transition animation from Apple Pay to PaymentSheet when presenting as a .formSheet on iPad.

Testing

Manually in iPad simulator, existing CI snapshot tests.