remove osx14 from the ridlist in the test

Author: marcpopMSFT

src/Assets/TestProjects/MSBuildTestApp/MSBuildTestApp.csproj

@@ -4,7 +4,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>$(CurrentTargetFramework)</TargetFramework>
-    <RuntimeIdentifiers>win7-x64;win7-x86;osx.10.12-x64;osx.14-x64;ubuntu.14.04-x64;ubuntu.16.04-x64;ubuntu.16.10-x64;rhel.8-x64;centos.7-x64;rhel.7-x64;debian.8-x64;fedora.24-x64;opensuse.42.1-x64;linux-musl-x64</RuntimeIdentifiers>
+    <RuntimeIdentifiers>win7-x64;win7-x86;osx.10.12-x64;ubuntu.14.04-x64;ubuntu.16.04-x64;ubuntu.16.10-x64;rhel.8-x64;centos.7-x64;rhel.7-x64;debian.8-x64;fedora.24-x64;opensuse.42.1-x64;linux-musl-x64</RuntimeIdentifiers>
     <RestoreAdditionalProjectSources Condition="'$(TEST_PACKAGES)' != ''">$(RestoreAdditionalProjectSources);$(TEST_PACKAGES)</RestoreAdditionalProjectSources>
     <ProduceReferenceAssembly>false</ProduceReferenceAssembly>
   </PropertyGroup>