Missing portable Linux packages for scenarion tests on VMR lite run

[mthalman]

When running dotnet-unified-build-unofficial (internal link) with the lite build scope, the following scenario test errors occur in SB legs:

/__w/1/s/src/scenario-tests/artifacts/obj/generatedtests/SdkTemplateTestsComplexPortable_Console_CSharp/SdkTemplateTestsComplexPortable_Console_CSharp.csproj : error NU1102: Unable to find package Microsoft.NETCore.App.Runtime.linux-x64 with version (= 10.0.0-rc.1.25506.101) [/__w/1/s/src/scenario-tests/src/Microsoft.DotNet.ScenarioTests.SdkTemplateTests/Microsoft.DotNet.ScenarioTests.SdkTemplateTests.csproj] [/__w/1/s/repo-projects/scenario-tests.proj]
/__w/1/s/src/scenario-tests/artifacts/obj/generatedtests/SdkTemplateTestsComplexPortable_Console_CSharp/SdkTemplateTestsComplexPortable_Console_CSharp.csproj : error NU1102: - Found 1473 version(s) in dotnet10 [ Nearest version: 10.0.0-rc.2.25416.105 ] [/__w/1/s/src/scenario-tests/src/Microsoft.DotNet.ScenarioTests.SdkTemplateTests/Microsoft.DotNet.ScenarioTests.SdkTemplateTests.csproj] [/__w/1/s/repo-projects/scenario-tests.proj]
/__w/1/s/src/scenario-tests/artifacts/obj/generatedtests/SdkTemplateTestsComplexPortable_Console_CSharp/SdkTemplateTestsComplexPortable_Console_CSharp.csproj : error NU1102: - Found 203 version(s) in dotnet-public [ Nearest version: 10.0.0-rc.1.25451.107 ] [/__w/1/s/src/scenario-tests/src/Microsoft.DotNet.ScenarioTests.SdkTemplateTests/Microsoft.DotNet.ScenarioTests.SdkTemplateTests.csproj] [/__w/1/s/repo-projects/scenario-tests.proj]
/__w/1/s/src/scenario-tests/artifacts/obj/generatedtests/SdkTemplateTestsComplexPortable_Console_CSharp/SdkTemplateTestsComplexPortable_Console_CSharp.csproj : error NU1102: - Found 1 version(s) in dotnet-eng [ Nearest version: 5.0.0-alpha.1.19618.1 ] [/__w/1/s/src/scenario-tests/src/Microsoft.DotNet.ScenarioTests.SdkTemplateTests/Microsoft.DotNet.ScenarioTests.SdkTemplateTests.csproj] [/__w/1/s/repo-projects/scenario-tests.proj]
/__w/1/s/src/scenario-tests/artifacts/obj/generatedtests/SdkTemplateTestsComplexPortable_Console_CSharp/SdkTemplateTestsComplexPortable_Console_CSharp.csproj : error NU1102: - Found 0 version(s) in /__w/1/s/artifacts/obj/extracted-dotnet-sdk/library-packs [/__w/1/s/src/scenario-tests/src/Microsoft.DotNet.ScenarioTests.SdkTemplateTests/Microsoft.DotNet.ScenarioTests.SdkTemplateTests.csproj] [/__w/1/s/repo-projects/scenario-tests.proj]
/__w/1/s/src/scenario-tests/artifacts/obj/generatedtests/SdkTemplateTestsComplexPortable_Console_CSharp/SdkTemplateTestsComplexPortable_Console_CSharp.csproj : error NU1102: - Found 0 version(s) in dotnet-libraries [/__w/1/s/src/scenario-tests/src/Microsoft.DotNet.ScenarioTests.SdkTemplateTests/Microsoft.DotNet.ScenarioTests.SdkTemplateTests.csproj] [/__w/1/s/repo-projects/scenario-tests.proj]
/__w/1/s/src/scenario-tests/artifacts/obj/generatedtests/SdkTemplateTestsComplexPortable_Console_CSharp/SdkTemplateTestsComplexPortable_Console_CSharp.csproj : error NU1102: - Found 0 version(s) in dotnet-tools [/__w/1/s/src/scenario-tests/src/Microsoft.DotNet.ScenarioTests.SdkTemplateTests/Microsoft.DotNet.ScenarioTests.SdkTemplateTests.csproj] [/__w/1/s/repo-projects/scenario-tests.proj]

Because this is a lite run, there are no jobs that produced these portable packages. So these tests should be skipped.