build images have pending assemblies to ngen about dotnet-framework-docker

[MichaelSimons]

The queued items to ngen are a result of running the VS installers.

If you invoke \Windows\Microsoft.NET\Framework\v4.0.30319\ngen update it will fail with the following error.

…
4>    Compiling assembly C:\Program Files (x86)\Microsoft Visual Studio\2017\TestAgent\Common7\IDE\VSWebHandler.exe (CLR v4.0.30319) ...
Failed to load dependency stdole of assembly Microsoft.VisualBasic.Compatibility, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a because of the following error : The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
Failed to load dependency MSDATASRC of assembly Microsoft.VisualBasic.Compatibility.Data, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a because of the following error : The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
Failed to load dependency ADODB of assembly Microsoft.VisualBasic.Compatibility.Data, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a because of the following error : The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
Failed to load dependency Microsoft.StdFormat of assembly Microsoft.VisualBasic.Compatibility.Data, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a because of the following error : The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
Failed to load dependency IpamServer of assembly Microsoft.Windows.ServerManager.Ipam.Plugin, Version=10.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 because of the following error : The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
Failed to load dependency Microsoft.ManagementConsole of assembly SecurityAuditPoliciesSnapIn, Version=10.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 because of the following error : The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
Failed to load dependency Microsoft.ManagementConsole of assembly SrpUxSnapIn, Version=10.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 because of the following error : The system cannot find the file specified. (Exception from HRESULT: 0x80070002)
The module was expected to contain an assembly manifest. (Exception from HRESULT: 0x80131018)
The most likely cause of this error is that NGen was invoked on a non-manifest module of a multi-module assembly.  The correct usage is to invoke NGen on the manifest module, which will cause native code generation to happen on the non-manifest modules as well.

In order to get ngen to succeed, you need to \Windows\Microsoft.NET\Framework\v4.0.30319\ngen uninstall "C:\Program Files (x86)\Microsoft Visual Studio\2017\TestAgent\Common7\IDE\VSWebLauncher.exe" first.

I'm notifying VS of this issue.