Exclude test projects from snyk scan #490

Job	Run time
init / run	16s
build-test-pack (AutoFakeItEasy) / run	1m 52s
build-test-pack (Core) / run	1m 39s
build-test-pack (AutoMoq) / run	1m 51s
build-test-pack (AutoNSubstitute) / run	1m 54s
publish	0s
tag	0s
	7m 32s

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