Restore lumberyards global illumination system to O3DE.

**So we can't bake global illumination without an rtx gpu. The old solution worked without it. Why not have both options. Also there are some issues with quality in the gi.

Describe the solution you'd like I would like the old global illumination system implemented into the engine in my opinion it looks better then the current option.

Describe alternatives you've considered I've considered baking light maps from blender to put into o3de but there is no light map options in the material.

Additional context here is a imagine of the current gi and old lumberyard gi. The Grassy on is lumberyard.