[Parity] Add test that validate `--[enable|disable]-dead-strip` option with SwiftBuild

[bkhouri]

The swift build --help has the following option

--enable-dead-strip/--disable-dead-strip
             Disable/enable dead code stripping by the linker. (default: --enable-dead-strip)

SwiftBuild currently supports the dead strip option. We need to ensure SwiftPM is setting the value correctly, and that automated tests exists.

[bkhouri]

The Swift Build integration has support for the dead-code-stripping.

https://github.com/swiftlang/swift-package-manager/blob/main/Sources/SwiftBuildSupport/SwiftBuildSystem.swift#L1083-L1085

I will leave this open so we can add automated tests.