Add lldb-dap to Swift distributions (#88482)

This includes the lldb-dap executable in the MacOS and Linux
distributions of Swift. Currently there is a commit in the Apple repo to
do this for just MacOS https://github.com/apple/llvm-project/pull/8176.
This PR extends this to both Linux and MacOS and brings the change
upstream.

@JDevlieghere @adrian-prantl