Remove arcade packaging workaround (#49613)

Author: ViktorHofer

Directory.Build.props

@@ -222,8 +222,6 @@
     <GitHubRepositoryName>runtime</GitHubRepositoryName>
     <RepositoryUrl>https://github.com/dotnet/$(GitHubRepositoryName)</RepositoryUrl>
     <PackageProjectUrl>https://dot.net</PackageProjectUrl>
-    <!-- Remove ProjectUrl after https://github.com/dotnet/arcade/pull/6995 is merged and consumed. -->
-    <ProjectUrl>$(PackageProjectUrl)</ProjectUrl>
     <Owners>microsoft,dotnetframework</Owners>
     <RuntimeIdGraphDefinitionFile>$([MSBuild]::NormalizePath('$(LibrariesProjectRoot)', 'Microsoft.NETCore.Platforms', 'pkg', 'runtime.json'))</RuntimeIdGraphDefinitionFile>
     <LicenseFile>$(MSBuildThisFileDirectory)LICENSE.TXT</LicenseFile>