Merge branch 'selftests-bpf-drop-xdping-tool'

Alexis Lothoré says:

====================
selftests/bpf: drop xdping tool

this is the v2 of the small series dropping xdping tool. This removal is
part of the larger effort aiming to tidy the bpf selftests directory.
This new revision updates btf_dump test to make it use another bpf
program rather than xdping_kern so that we can drop it as well.
====================

Link: https://patch.msgid.link/20260422-xdping-v2-0-c0f8ccedcf91@bootlin.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>