Handle invalid texture profile configuration

[britzl]

With the introduction of Basis Universal texture compression came changes to how we compress and handle textures in our build pipeline and at runtime. Previously we let the developer explicitly decide which compressed format to use through our texture profile system. This workflow is no longer supported and with this fix we have made the last couple of changes both to our build pipeline and editor to handle existing invalid texture profile configurations and to prevent the user from selecting formats which we no longer support.

Fixes #6377

[britzl]

This PR requires some additional work in the editor to improve how the texture profiles are set up. It should only be possible to set up one type+format+compression-level per profile+platform combo. It is currently possible to set up more than one. This should be prohibited. Also it would make sense to let the user first pick Type (None or basis_uastc), then format (rgb, rgba, luminance etc) and then finally compress level (fast, best etc).