Attempt to fix restore internal tools #2255
                
     Merged
            
            
          
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Attempts to fix: #2199
Arcade templates install NugetAuthenticator always, and then we were re-installing it with a service credential, but it wasn't installed because there was already one installed. So I'm forcing our installation.
Also, update the SDK we use to the latest daily build which fixes a lot of reliability bugs in NuGet.
I added an empty variable declaration that someone missed in another change causing a wrong parameter to be passed down when it was not declared.
Note: I ran 2 official builds from my branch and they didn't hit the issue anymore
cc: @dotnet/runtime-infrastructure