Incompatibility with Test Explorer introduced in 3.0

[onionhammer]

In visual studio code:

The issue stems from the xunit.runner.visualstudio NuGet package, starting with version 3.0.0-pre.42.

This happens because Test Explorer relies on the XUnit adapter to retrieve all necessary information, but the adapter does not provide the File Path in its output.

@AbhitejJohn, this is not a bug in our implementation. However, the same root cause is responsible for the issue [BUG] Test Explorer doesn't navigate to test: #1704.

To improve the reliability of Test Explorer, we need to redesign it to leverage Roslyn for retrieving test information, similar to how it works in Visual Studio.

Reference here: microsoft/vscode-dotnettools#1712 (comment)

[bradwilson]

Dup #433