Conflict between Text and UiImage components when a ui node has both

## Bevy version

Bevy 0.9

## What went wrong

If you add both the image and text components to a UI node you get a mess:


Until archetype invariants can be enforced (#5121), users can't be prevented from adding both components.

It's natural for a user who wants to add a caption to an image to naively add text components to an ImageBundle and sometimes it will work.

## What solution would you like?

I think only drawing the text, and emitting a warning explaining why the image isn't shown is probably the best that can be done for now.