[6.0] CMake: add option to link Swift content from Darwin toolchain #73283
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Explanation: introduce a CMake option that allow Swift binaries to link against content in Darwin toolchains -- this is needed in some Apple internal configurations
Radar: rdar://127014753
Scope: CMake build logic that configure the build for Swift binaries on Darwin platforms
Risk: low -- this behaviour is opt in
Testing: CI testing -- in particular ensured we can build a toolchain
Reviewed By: @compnerd and @al45tair in #73255