Exclude test projects from snyk scan #496

Job	Run time
init / run	17s
build-test-pack (AutoNSubstitute) / run	2m 2s
build-test-pack (AutoMoq) / run	2m 17s
build-test-pack (AutoFakeItEasy) / run	1m 52s
build-test-pack (Core) / run	1m 36s
publish	0s
tag	0s
	8m 4s

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