Re-disable IsWindowsOnlyTest on ARM (#28257)

* Re-disable IsWindowsOnlyTest on ARM

* Update Helix.Common.props

Author: Tratcher

eng/targets/Helix.Common.props

@@ -44,7 +44,8 @@
   <ItemGroup Condition="'$(TargetArchitecture)' == 'arm64' AND '$(IsHelixDaily)' == 'true' AND '$(IsWindowsOnlyTest)' != 'true'">
     <HelixAvailableTargetQueue Include="(Debian.9.Arm64.Open)[email protected]/dotnet-buildtools/prereqs:debian-9-helix-arm64v8-a12566d-20190807161036" Platform="Linux" />
   </ItemGroup>
-  <ItemGroup Condition="'$(TargetArchitecture)' == 'arm64' AND '$(IsHelixDaily)' == 'true'">
+  <!-- IIS Express isn't supported on arm64 and most of the IsWindowsOnlyTests depend on it's setup scripts. -->
+  <ItemGroup Condition="'$(TargetArchitecture)' == 'arm64' AND '$(IsHelixDaily)' == 'true' AND '$(IsWindowsOnlyTest)' != 'true'">
     <HelixAvailableTargetQueue Include="Windows.10.Arm64v8.Open" Platform="Windows" />
   </ItemGroup>
 </Project>