Same issue as skiptools/skipstone#244.

A representative failure can be seen at https://github.com/skiptools/swift-android-action/actions/runs/25218190810/job/73943529086:

cp: cannot stat '.build/x86_64-unknown-linux-android28/debug/*.xctest': No such file or directory

We might want to use swift build --show-bin-path to show the correct output path, but we will still need to determine whether to copy swift-algorithmsPackageTests.xctest versus SwiftAlgorithmsTests-test-runner.