D96202 removes the test dependencies on debugserver/lldb-server which is causing a bunch of
tests to fail on a clean build.
This patch re-adds those dependencies. I decided to not add the dependencies in the test/API
folder as we actually need those dependencies in all kinds of tests (we have shell, API and a few unit
tests such as the LLDBServerTests that depend on these binaries).
I was worried about the situation where we tell LLDB to test with the system debugserver, but unless I misremember the target won't be there when that's the case, so this is perfect.