Disable pack determinism because of unforeseen impact on deployment tools

NuGet side of https://github.com/dotnet/core/issues/3388. 

Figure out the NuGet actions, if any. 
Update: looks like we are disabling the "determinisitic pack" behavior in a new build of 3.0.0 and VS 16.3

Insertion bug: https://devdiv.visualstudio.com/DevDiv/_queries/edit/984463

fyi @rrelyea 