Remove VersionPrefix so that it is inferred

[ViktorHofer]

Contributes to dotnet/runtime#66447

Remove the VersionPrefix property so that it is inferred from the Versions.props versions (MajorVersion, MinorVersion, PatchVersion) which is the Arcade default behavior. This will cause the package version to bump to 7.0.0-....

I'm also changing the feeds to that the transport package now pushes into the dotnet7-transport feed instead of dotnet6-transport.

[ViktorHofer]

The build fails with

  CMake Error at CMakeLists.txt:40 (project):
    Generator
  
  -- Configuring incomplete, errors occurred!
  See also "D:/a/1/s/src/msquic/build/windows/x64_schannel/CMakeFiles/CMakeOutput.log".
      Visual Studio 16 2019
  
    could not find any instance of Visual Studio.
  
  
  
  CMake-Execute: D:\a\1\s\src\msquic\scripts\build.ps1:403

That error is unrelated. Is this repo's CI currently broken?

[ManickaP]

Looks like it was fine yesterday based on @wfurt PR. I guess it's actions/runner-images#4856 and update to newer Windows and with this newer VS. Possible solution: use older windows-2019 pool or upgrade build scripts.
I'll look into it tomorrow unless someone fixes it in the meantime.

[nibanks]

Yes, you need to consume the latest MsQuic to work on 2022, otherwise use 2019 for the time being.

[ManickaP]

I merged @wfurt PR, that should help here.