Build TestPlatform packages in VMR (#15055)

but with the MIT license instead of VS.

Fixes dotnet/source-build#4996

Author: ViktorHofer

src/package/Microsoft.TestPlatform.Portable/Microsoft.TestPlatform.Portable.csproj

@@ -16,8 +16,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <!-- Don't produce this package when building from source or inside the VMR as it relies on a VS license. -->
-    <IsPackable Condition="'$(DotNetBuild)' != 'true'">true</IsPackable>
+    <IsPackable>true</IsPackable>
     <NuspecFile>Microsoft.TestPlatform.Portable.nuspec</NuspecFile>
     <NuspecBasePath>$(OutputPath)</NuspecBasePath>
     <PackageId>Microsoft.TestPlatform.Portable</PackageId>
@@ -32,7 +31,9 @@
     </PackageDescription>
     <!-- Override default license -->
     <PackageLicenseFile>LICENSE_VS.txt</PackageLicenseFile>
-    <PackageLicenseFullPath>$(SrcPackageFolder)licenses/LICENSE_VS.txt</PackageLicenseFullPath>
+    <!-- Use the MIT license when building from the VMR as the VS license is cloaked out. -->
+    <PackageLicenseFile Condition="'$(DotNetBuild)' == 'true'">LICENSE_MIT.txt</PackageLicenseFile>
+    <PackageLicenseFullPath>$(SrcPackageFolder)licenses/$(PackageLicenseFile)</PackageLicenseFullPath>
   </PropertyGroup>
 
   <ItemGroup Label="NuGet">

src/package/Microsoft.TestPlatform/Microsoft.TestPlatform.csproj

@@ -15,8 +15,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <!-- Don't produce this package when building from source or inside the VMR as it relies on a VS license. -->
-    <IsPackable Condition="'$(DotNetBuild)' != 'true'">true</IsPackable>
+    <IsPackable>true</IsPackable>
     <NuspecFile>Microsoft.TestPlatform.nuspec</NuspecFile>
     <NuspecBasePath>$(OutputPath)</NuspecBasePath>
     <PackageId>Microsoft.TestPlatform</PackageId>
@@ -34,7 +33,9 @@
     </PackageDescription>
     <!-- Override default license -->
     <PackageLicenseFile>LICENSE_VS.txt</PackageLicenseFile>
-    <PackageLicenseFullPath>$(SrcPackageFolder)licenses/LICENSE_VS.txt</PackageLicenseFullPath>
+    <!-- Use the MIT license when building from the VMR as the VS license is cloaked out. -->
+    <PackageLicenseFile Condition="'$(DotNetBuild)' == 'true'">LICENSE_MIT.txt</PackageLicenseFile>
+    <PackageLicenseFullPath>$(SrcPackageFolder)licenses/$(PackageLicenseFile)</PackageLicenseFullPath>
   </PropertyGroup>
 
   <ItemGroup Label="NuGet">