The `animated_ui` example should interpolate the text entity's `UiTransform`, not its font size

[ickshonpe]

Problem

The animated_ui example interpolates the font size of the animated text entity, which rapidly generates gigabytes of font atlase images.

Even with #22646, it's not good practice.

Solution

The animated_ui example should spawn the text with its font size set to the maximum value from the old animation curve. Then scale the text by interpolating the UiTransform::scale field, instead of the font size.

[ickshonpe]

I think this must be fixed or removed from 0.18. You can see how quickly it eats up ram:

https://bevy.org/examples/animation/animated-ui/