Adopt SwiftBuild.ProjectModel API in the new PIF builder in SwiftBuildSupport#8441

pmattos merged 12 commits intomainswiftlang/swift-package-manager:mainfrom

pmattos/pif-with-project-model-APIswiftlang/swift-package-manager:pmattos/pif-with-project-model-APICopy head branch name to clipboard