Ensure templates are built via a pipeline to support CG

[siramvikram]

The below templates need to be built using a pipeline so that CG is run on them

Class Library
Console Application
MSTest Playwright Test Project
MSTest Test Project
NUnit 3 Test Project
xUnit Test Project
NUnit Playwright Test Project

[marcpopMSFT]

console and classlib don't reference any external packages so nothing for CG to scan. We don't typically flag targeting packs or runtime packs which could potentially be downloaded implicitly. So for those, I wouldn't bother. Marking for the test team to take a look at the others and make a call.

[marcpopMSFT]

BTW, I have an internal draft of how to run a set of tests after the SDK build if you want to build off of that. Ping me offline and I can point you at what I did.