Add validation to test that OOB packages have no SharedFx-only references

[wtgodbe]

We had a situation in 8.0 where Microsoft.Extensions.Caching.StackExchangeRedis (which is an OOB package) added a dependency on Microsoft.AspNetCore.OutputCaching (which is SharedFx-only), which caused StackExchangeRedis to have a FrameworkReference on AspNetCore.App. This means devs using StackExchangeRedis would need to have Asp.Net installed on their machine in order to use the package, which goes against the principle of an OOB package (they should be useable by non-asp.net devs). We should add validation, maybe in ResolveReferences.targets, that prevents this from happening again, as it's a very easy mistake to make.

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[Tratcher]

This issue only applies to Extensions, right? Note all of the Authentication OOB packages do require the shared framework.

[wtgodbe]

This issue only applies to Extensions, right? Note all of the Authentication OOB packages do require the shared framework.

Oh, I didn't know that. If that's the case then yeah, seems like this should only apply to Extensions