Switch vsix packing to use Nuget.config (#14209)#14238

sean-mcmanus merged 1 commit intoreleasemicrosoft/vscode-cpptools:releasefrom

seanmcm/cherryPicka5d00e31230bdad1d171d1fd1421ac97fa77b275microsoft/vscode-cpptools:seanmcm/cherryPicka5d00e31230bdad1d171d1fd1421ac97fa77b275Copy head branch name to clipboard