[cherry-pick][release/5.9] [Build] Make sure lldb API tests run against newly built libcxx #66026
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Currently any buildbot that runs LLDB API tests does so against the system SDK. However, we explicitly need users to run the tests against a newly built libcxx. We recently added a new
LLDB_TEST_LIBCXX_ROOT_DIR
CMake variable to LLDB to allow standalone builds to point their tests to a custom libcxx directory.This patch makes sure the relevant LLDB presets build libcxx and then sets above CMake variable.
(cherry picked from commit 0c974e0)