Merge branch 'selftests-bpf-migrate-test_xdp_vlan-sh-into-test_progs'

Bastien Curutchet says:

====================
selftests/bpf: Migrate test_xdp_vlan.sh into test_progs

Hi all,

This patch series continues the work to migrate the script tests into
prog_tests.

test_xdp_vlan.sh tests the ability of an XDP program to modify the VLAN
ids on the fly. This isn't currently covered by an other test in the
test_progs framework so I add a new file prog_tests/xdp_vlan.c that does
the exact same tests (same network topology, same BPF programs) and
remove the script.
====================

Link: https://patch.msgid.link/20250221-xdp_vlan-v1-0-7d29847169af@bootlin.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>