These are required for Visual Studio 2019 support.

There are assemblies with exactly the same IAsyncServiceProvider
namespace + name. Change to use IServiceProvider instead to avoid
having to use assembly aliases. These were getting more complication
with the introduction of Visual Studio 2019 support.

The ServiceProgressData type is in a Visual Studio 2019 assembly that
we don't currently have access to. Using reflection to call the
CloneAsync in order to avoid conflicts with the Visual Studio 2017
version. Progress won't be displayed on the status bar, but it appears
prominently on the Team Explorer Home view.

Create a GitHub.TeamFoundation.16 project that will install and execute
inside Visual Studio 2019.

Stop the `How would you like to get started?` dialog from appearing
when a repository is double clicked on.

Convert GitHubConnectSection to use
ITeamExplorerServices.OpenRepository instead of
IVSServices.TryOpenRepository to change repository context. This method
knows how to change context for Visual Studio 2015, 2017 and 2019.

BrowsesToTheCorrectURL was already being ignored but is now failing to
compile.