[lldb][test] Give a directly created lldb-dap session the init commands (#213553)
create_debug_adapter passes the commands that carry the configuration
the test suite was invoked with, and a test that builds a
DebugAdapterServer itself got none of them, so that session ran
unconfigured. It matters wherever the suite configures the debugger
through settings, such as pointing a platform at the runtime it
launches.