Add warning log for sprite picking failure on compressed textures

[mirsella]

Objective

fixes #22413
from this issue:

currently, with SpritePickingMode::AlphaThreshold sprite picking silently fail on image format like bc7, uastc, etc, since its not possible to get the pixel alpha value at a specific location, as the image is compressed in memory. currently the code break the loop and silently skip picking for the sprite.
#20574 made it not panic anymore

its very hard to debug why a sprite picking doesn't work when encountering this issue, i think a warn is really useful.

Solution

add a warn! log

Testing

tested on my own project

is the log message adapted ?

thanks

[mirsella]

hm this requires adding bevy_log dep to bevy_sprite, dunno if thats acceptable ?

[JMS55]

Approved with one nit. Adding bevy_log dep is fine.

[mirsella]

im getting this warn even when not using compressed assets because of another problem
bevy_sprite::picking_backend: Failed to get pixel color for sprite picking on entity 454v1: OutOfBounds { x: 400, y: 295, z: 0 }. This is probably caused by the use of a compressed texture format. Consider using `SpritePickingMode::BoundingBox`.
im gonna only warn on the specific error used when its because of compressed assets

[alice-i-cecile]

Ping me when this is ready for review and I'll take a look :)

[mirsella]

@alice-i-cecile ready, this is much better now :)