Switch to Nuget Central Package Management

[jonathanou]

Justification

Since .NET 6.0.300, there is a new Central Package Management (CPM) feature that allows tracking nuget versions centrally. CPM relies on a new Directory.Packages.props file to maintain the list of nuget package versions and by default all projects cannot specify nuget versions—the build will break otherwise.

We should switch to using CPM to help simplify our build management, and ensure that all projects are using the same nuget package versions—switching to CPM will also make updating nuget packages in the future a lot easier.

Implementation

• Extract all package reference versions to Directory.Packages.props.
• Remove version specifications in the original <PackageReference elements.

Testing

Continues to build.

[jryckman]

Approving now that Pete has approved