[6.0] Properly handle swift-testing installations in toolchain/SDK#7856

xedin merged 1 commit intoswiftlang:release/6.0swiftlang/swift-package-manager:release/6.0from

xedin:swift-testing-in-toolchain-6.0xedin/swift-package-manager:swift-testing-in-toolchain-6.0Copy head branch name to clipboard