.NET

Add unit test for faceforward intrinsic #5663

Job	Run time
build-packages	3m 2s
build-solution (Debug, x64)	6m 3s
build-solution (Debug, arm64)	5m 22s
build-solution (Release, x64)	7m 27s
build-solution (Release, arm64)	6m 49s
verify-packages	6m 15s
run-samples	3m 2s
run-tests	7m 4s
run-samples-aot (x64)	6m 3s
run-samples-aot (arm64)	5m 22s
run-tests-d3d12ma	4m 37s
run-tests-win2d	4m 22s
publish-nightlies-github	21s
publish-nightlies-azure-devops	30s
	1h 6m 19s

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