Added basic tests for asset loaders (#6964)

[Wcubed]

Objective

Add basic tests for image / gltf asset loading. As a start for #6964.

[Wcubed]

Can you also add a final test that asserts that all of the images from each of the formats match?

I don't think this will work. Given that different image formats have different compression algorithms, the loaded images are not guaranteed to be equal.

[bas-ie]

This is cool! Rather than close this one, I'm nabbing it for myself to get it the rest of the way :laughing:

[BenjaminBrienen]

@bas-ie what is your status on that?

[bas-ie]

Oooo, October '24! Shame on me :sweat_smile: lemme sort this one, ty for the reminder.