Remove dotnet restore from tagreleases.sh
Remove dotnet restore from tagreleases.sh

This is unnecessary now, and fails on Linux because of projects in tools that want full .NET

(Also simplify the dotnet run command.)

jskeet/google-cloud-dotnet,googleapis/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,googleapis/google-cloud-dotnet,jskeet/google-cloud-dotnet,googleapis/google-cloud-dotnet,jskeet/gcloud-dotnet