CMake: replaced format validation instructions with add_format_validation_target
CMake: replaced format validation instructions with add_format_validation_target

DiligentGraphics/DiligentSamples,DiligentGraphics/DiligentSamples,DiligentGraphics/DiligentSamples,DiligentGraphics/DiligentSamples,DiligentGraphics/DiligentSamples,DiligentGraphics/DiligentSamples