Merge branch 'selftests-move-bpf-offload-test-from-bpf-to-net'

Jakub Kicinski says:

====================
selftests: move bpf-offload test from bpf to net

The test_offload.py test fits in networking and bpf equally
well. We started adding more Python tests in networking
and some of the code in test_offload.py can be reused,
so move it to networking. Looks like it bit rotted over
time and some fixes are needed.

Admittedly more code could be extracted but I only had
the time for a minor cleanup :(
====================

Link: https://lore.kernel.org/r/20240409031549.3531084-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>