TextureAtlas is still a component #16064
Description
Bevy version
0.15.0-rc.1
What you did
Migrated to bevy 0.15.0-rc.1, fixed errors until code compiled.
What went wrong
The TextureAtlas component on a sprite entity was silently ignored, because TextureAtlas should now be a field of Sprite instead -- but TextureAtlas still impls Component. This is because UiImage still expects it as a component, which is inconsistent / confusing and should be fixed for 0.15.