selftests/bpf: Test unwind_exit of an exception callback

In both tests the prog that throws returns to a call that unwind_goto
follows, and its exception callback ends with unwind_exit:
- An extension replaces a subprog that cannot unwind. unwind_goto after
  the call stays, since it shares the pad with a call of a subprog that
  can unwind.
- A subprog that can unwind does a tail call.

unwind_exit of the callback has to be exit. Without the fix the callers go
to the pad and return 2 instead of 3 and 42 instead of 7.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20261020231942.2568163-4-alexei.starovoitov@gmail.com

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