Consider supporting NoWarn on PackageVersion items

[ericstj]

NuGet Product(s) Involved

NuGet.exe, MSBuild.exe, dotnet.exe

The Elevator Pitch

It might be easier to suppress a warning on a PackageVersion rather than all PackageReferences when a repo is using CPM. If this is possible (merely join and append the values) I think it would allow for a better user experience.

Additional Context and Details

Here's the change which provoked this suggestion: gitextensions/gitextensions#11911