[dotnet] Try to implement a workaround for xamarin/maccore#2427. #11897
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We randomly run into a NuGet restore failure, which breaks the build, and is
quite annoying.
This might be due to a problem with multiple simultaneous restores, so this is
an attempt to first restore the packages we need, in a single serialized
restore, and once that's done we can process everything else in parallel.
Ref: https://github.com/xamarin/maccore/issues/2427
Ref: NuGet/Home#10935