Refactor Directory.Build.props to be specific to the version of .NET and use wild cards

We could get into problems having all the different projects (.NET 3.1, .NET 8, someday 9), all using the same versions of dependencies. We should have a folder for each version of .NET and a Directory.Build.props specific to it.

We should also wild card more of the versions in order for the canaries to say up to date on the latest versions.

Start by inspecting the repository's Directory.Build.props and the project files targeting .NET 3.1 and .NET 8. Identify which dependency versions are shared and how the projects are discovered. Done means each .NET version uses an appropriate Directory.Build.props and canary dependency versions are wildcarded as intended.

Written by the indexing model from the issue text.