[Workspace] Skip double resolve for PubGrub
[Workspace] Skip double resolve for PubGrub

We don't need to resolve twice for PubGrub since it can handle
Package.resolved natively.

apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager