Fix HandleQueuedPackageEditsJob to use ExecuteTask

Because some idiot made it so you have to execute tasks this way in order for logging to work. Who was that? Oh... right... me...
Merge pull request #1478 from NuGet/anurse/1463-fixloggingineditablemetadata

Fix #1463 by changing HandleQueuedPackageEditsJob to use ExecuteTask