[lldb/Plugin] Test that a scripted process blueprint can be loaded for the dSYM

This patch ensures that lldb can automatically load a scripted process
blueprint from a dSYM bundle and launch a scripted process with it.

rdar://74502750

Differential Revision: https://reviews.llvm.org/D121316



Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>