Fix broken runtime tests build (#89115)

* Fix broken runtime tests build

Follow-up on https://github.com/dotnet/runtime/pull/89005

* Update build-test-job.yml

* Update sfx-ref.proj

eng/native/ijw/getRefPackFolderFromArtifacts.ps1

@@ -14,7 +14,7 @@ $refPackPath = "$repoRoot/artifacts/bin/ref/net$majorVersion.$minorVersion"
 
 if (-not (Test-Path $refPackPath))
 {
-    Write-Error "Reference assemblies not found in the artifacts folder at '$refPackPath'. Did you invoke 'build.cmd libs.sfx+libs.oob /p:RefOnly=true' to make sure that refs are built? Did the repo layout change?"
+    Write-Error "Reference assemblies not found in the artifacts folder at '$refPackPath'. Did you invoke 'build.cmd libs.sfx+libs.oob' to make sure that refs are built? Did the repo layout change?"
     exit 1
 }
 

eng/pipelines/common/templates/runtimes/build-test-job.yml

@@ -69,7 +69,7 @@ jobs:
       - ${{ each variable in parameters.variables }}:
         - ${{ variable }}
       - name: liveRuntimeBuildParams
-        value: 'libs.sfx+libs.oob+clr.iltools /p:RefOnly=true -c Release -ci'
+        value: 'libs.sfx+libs.oob+clr.iltools -c Release -ci'
       - name: compilerArg
         value: ''
 

src/libraries/sfx-ref.proj

 <Project Sdk="Microsoft.Build.Traversal">
 
   <PropertyGroup>
-    <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
+    <TargetFramework>$(NetCoreAppCurrent)-$(TargetOS)</TargetFramework>
     <!-- Filter ProjectReferences to build the best matching target framework only. -->
     <FilterTraversalProjectReferences>true</FilterTraversalProjectReferences>
   </PropertyGroup>