[lldb][CMake] Force OBJECT libraries to also be STATIC (#196222)
When add_lldb_library is called with OBJECT, llvm_add_library would also
produce a SHARED variant under BUILD_SHARED_LIBS=ON. That variant fails
to link because a5a13ca29186 intentionally moved lldbDAP's LINK_LIBS to
its consumers.
Pass STATIC alongside OBJECT so the secondary variant is always an
archive, matching the LLVMTableGenCommon pattern. Fixes
BUILD_SHARED_LIBS=ON breakage reported on #196108.