[6.0.0] Update package templates to use Swift Testing in the toolchain rather than as a package dependency.#7911

shahmishal merged 2 commits intorelease/6.0.0swiftlang/swift-package-manager:release/6.0.0from

jgrynspan/update-package-templates-to-use-swift-testing-6.0.0swiftlang/swift-package-manager:jgrynspan/update-package-templates-to-use-swift-testing-6.0.0Copy head branch name to clipboard