Specify version of xunit.console.dll during the custom build

[echesakov]

Thanks to @janvorli we know the reason of failures in https://github.com/dotnet/coreclr/issues/20797:

[9:05 AM] Jan Vorlicek
So, I can see that the function that it reports as missing is in xunit.runner.utility.netcoreapp10.dll. The difference between the one from your package and the one that I have in Core_Root is the version. And your xunit.console.dll references the xunit.runner.utility.netcoreapp10.dll of version 99.99.99.0 while the xunit.runner.utility.netcoreapp10.dll that I had in Core_Root was 2.4.1.4059.
Maybe R2R is more sensitive to the versions than non-R2R, which could explain the difference.

This PR switches to using custom xunit.console.dll with specified assembly version (v2.4.1) during the build and update our dependencies.props to use stable Xunit v2.4.1

Fixes #20797

[echesakov]

@dotnet-bot test Ubuntu16.04 arm64 Cross Checked r2r Build and Test
@dotnet-bot test Ubuntu arm Cross Checked r2r Build and Test

@dotnet-bot test Windows_NT x64 Checked r2r
@dotnet-bot test Windows_NT x64 Release r2r

@dotnet-bot test Windows_NT x86 Checked r2r
@dotnet-bot test Windows_NT x86 Release r2r

@dotnet-bot test CentOS7.1 x64 Checked r2r
@dotnet-bot test Ubuntu x64 Checked r2r

[echesakov]

@dotnet-bot test Ubuntu16.04 arm64 Cross Checked r2r Build and Test
@dotnet-bot test Ubuntu arm Cross Checked r2r Build and Test

@dotnet-bot test Windows_NT x64 Checked r2r
@dotnet-bot test Windows_NT x64 Release r2r
@dotnet-bot test Windows_NT x86 Checked r2r
@dotnet-bot test Windows_NT x86 Release r2r

@dotnet-bot test CentOS7.1 x64 Checked r2r
@dotnet-bot test Ubuntu x64 Checked r2r

[echesakov]

@dotnet-bot test CentOS7.1 x64 Checked r2r

[echesakov]

test OSX10.12 x64 Checked Innerloop Build and Test

[echesakov]

Windows_NT x64 Release R2R Build and Test and Windows_NT x86 Release R2R Build and Test are test failures