Restore NuGet packages in separate step.
Restore NuGet packages in separate step.

This more closely mirrors the steps in the unit_tests job.

mnaiman/duplicati,duplicati/duplicati,mnaiman/duplicati,duplicati/duplicati,duplicati/duplicati,mnaiman/duplicati,duplicati/duplicati,mnaiman/duplicati,mnaiman/duplicati,duplicati/duplicati