selftests/bpf: Add tests for uprobe auto-attach via skeleton

tests that verify auto-attach works for function entry/return for
local functions in program and library functions in a library.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1648654000-21758-6-git-send-email-alan.maguire@oracle.com