Set PackageProjectUrl in Directory.Build.props instead of sdk.proj (#47506)

Author: akoeplinger

Directory.Build.props

@@ -66,6 +66,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
+    <PackageProjectUrl>https://github.com/dotnet/sdk</PackageProjectUrl>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <LangVersion>Latest</LangVersion>
     <TreatWarningsAsErrors>True</TreatWarningsAsErrors>

src/SourceBuild/content/repo-projects/sdk.proj

@@ -7,7 +7,6 @@
     <DotNetBuildTestsOptOut Condition="'$(OS)' != 'Windows_NT'">true</DotNetBuildTestsOptOut>
 
     <BuildArgs Condition="'$(TargetOS)' == 'windows'">$(BuildArgs) -nativeToolsOnMachine</BuildArgs>
-    <BuildArgs>$(BuildArgs) /p:PackageProjectUrl=https://github.com/dotnet/sdk</BuildArgs>
     <BuildArgs>$(BuildArgs) /p:PortableRid=$(PortableRid)</BuildArgs>
 
     <BuildArgs>$(BuildArgs) $(FlagParameterPrefix)v $(LogVerbosity)</BuildArgs>