Install NuGet and its dependencies in mirror stage of release pipeline

[mthalman]

Fixes #3423

[ghost]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[premun]

I am not sure if we want mono - isn't it better to install .NET 7 and use dotnet nuget ...?

[premun]

Again, maybe Arcade here would help

[mthalman]

I am not sure if we want mono - isn't it better to install .NET 7 and use dotnet nuget ...?

I've tried that but haven't been unable to get it authenticated to the feed. And even then, I was only able to get this to work by adding the NuGetAuthenticate task.

[premun]

So .NET 7 SDK + NuGet Authenticate wouldn't work?

That's so weird.. I imagine that's what was on the 1es-ubuntu image

[mthalman]

So .NET 7 SDK + NuGet Authenticate wouldn't work?

That's so weird.. I imagine that's what was on the 1es-ubuntu image

Nope, that didn't work in my testing. I've tried all sorts of combinations and these changes are the only thing that worked.