xunit-related prebuilts from Arcade

[mthalman]

Offline builds for the VMR are currently failing:

/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.RemoteExecutor/src/Microsoft.DotNet.RemoteExecutor.csproj : error NU1101: Unable to find package Microsoft.Diagnostics.Runtime. No packages exist with this id in source(s): prebuilt, previously-source-built, reference-packages, source-built [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitConsoleRunner/src/Microsoft.DotNet.XUnitConsoleRunner.csproj : error NU1101: Unable to find package xunit.runner.reporters. No packages exist with this id in source(s): prebuilt, previously-source-built, reference-packages, source-built [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitConsoleRunner/src/Microsoft.DotNet.XUnitConsoleRunner.csproj : error NU1102: Unable to find package xunit.runner.utility with version (= 2.5.3) [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitConsoleRunner/src/Microsoft.DotNet.XUnitConsoleRunner.csproj : error NU1102:   - Found 1 version(s) in previously-source-built [ Nearest version: 2.4.2 ] [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitConsoleRunner/src/Microsoft.DotNet.XUnitConsoleRunner.csproj : error NU1102:   - Found 0 version(s) in source-built [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitConsoleRunner/src/Microsoft.DotNet.XUnitConsoleRunner.csproj : error NU1102:   - Found 0 version(s) in prebuilt [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitConsoleRunner/src/Microsoft.DotNet.XUnitConsoleRunner.csproj : error NU1102:   - Found 0 version(s) in reference-packages [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitExtensions/src/Microsoft.DotNet.XUnitExtensions.csproj : error NU1102: Unable to find package xunit.extensibility.core with version (>= 2.5.3) [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitExtensions/src/Microsoft.DotNet.XUnitExtensions.csproj : error NU1102:   - Found 1 version(s) in previously-source-built [ Nearest version: 2.4.2 ] [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitExtensions/src/Microsoft.DotNet.XUnitExtensions.csproj : error NU1102:   - Found 0 version(s) in source-built [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitExtensions/src/Microsoft.DotNet.XUnitExtensions.csproj : error NU1102:   - Found 0 version(s) in prebuilt [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitExtensions/src/Microsoft.DotNet.XUnitExtensions.csproj : error NU1102:   - Found 0 version(s) in reference-packages [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitExtensions/src/Microsoft.DotNet.XUnitExtensions.csproj : error NU1102: Unable to find package xunit.extensibility.execution with version (>= 2.5.3) [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitExtensions/src/Microsoft.DotNet.XUnitExtensions.csproj : error NU1102:   - Found 1 version(s) in previously-source-built [ Nearest version: 2.4.2 ] [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitExtensions/src/Microsoft.DotNet.XUnitExtensions.csproj : error NU1102:   - Found 0 version(s) in source-built [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitExtensions/src/Microsoft.DotNet.XUnitExtensions.csproj : error NU1102:   - Found 0 version(s) in prebuilt [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitExtensions/src/Microsoft.DotNet.XUnitExtensions.csproj : error NU1102:   - Found 0 version(s) in reference-packages [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitAssert/src/Microsoft.DotNet.XUnitAssert.csproj : error NU1102: Unable to find package Microsoft.NETCore.App.Ref with version (= 6.0.22) [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitAssert/src/Microsoft.DotNet.XUnitAssert.csproj : error NU1102:   - Found 7 version(s) in previously-source-built [ Nearest version: 7.0.0 ] [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitAssert/src/Microsoft.DotNet.XUnitAssert.csproj : error NU1102:   - Found 7 version(s) in reference-packages [ Nearest version: 7.0.0 ] [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitAssert/src/Microsoft.DotNet.XUnitAssert.csproj : error NU1102:   - Found 2 version(s) in prebuilt [ Nearest version: 8.0.0-preview.7.23375.6 ] [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitAssert/src/Microsoft.DotNet.XUnitAssert.csproj : error NU1102:   - Found 0 version(s) in source-built [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitAssert/src/Microsoft.DotNet.XUnitAssert.csproj : error NU1102: Unable to find package Microsoft.AspNetCore.App.Ref with version (= 6.0.22) [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitAssert/src/Microsoft.DotNet.XUnitAssert.csproj : error NU1102:   - Found 3 version(s) in prebuilt [ Nearest version: 8.0.0-preview.7.23375.9 ] [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitAssert/src/Microsoft.DotNet.XUnitAssert.csproj : error NU1102:   - Found 2 version(s) in previously-source-built [ Nearest version: 9.0.0-alpha.1.23577.26 ] [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitAssert/src/Microsoft.DotNet.XUnitAssert.csproj : error NU1102:   - Found 1 version(s) in reference-packages [ Nearest version: 6.0.2 ] [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Microsoft.DotNet.XUnitAssert/src/Microsoft.DotNet.XUnitAssert.csproj : error NU1102:   - Found 0 version(s) in source-built [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]
/vmr/src/arcade/artifacts/source-build/self/src/src/Common/Microsoft.Arcade.Test.Common/Microsoft.Arcade.Test.Common.csproj : error NU1101: Unable to find package xunit. No packages exist with this id in source(s): prebuilt, previously-source-built, reference-packages, source-built [/vmr/src/arcade/artifacts/source-build/self/src/Arcade.sln]

[ellahathaway]

As pointed out in dotnet/source-build-reference-packages#860 (comment), this should be resolved when the VMR is re-bootstrapped: #3815