selftests/net: Split netdevsim tests from HW tests in nk_qlease

As pointed out in 3d2c3d2eea ("selftests: net: py: explicitly forbid
multiple ksft_run() calls"), ksft_run() cannot be called multiple times.

Move the netdevsim-based queue lease tests to selftests/net/ so that
each file has exactly one ksft_run() call.

The HW tests (io_uring ZC RX, queue attrs, XDP with MP, destroy) remain
in selftests/drivers/net/hw/.

Fixes: 65d657d806 ("selftests/net: Add queue leasing tests with netkit")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/netdev/20260409181950.7e099b6c@kernel.org
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20260413220809.604592-3-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/Makefile

@@ -65,6 +65,7 @@ TEST_PROGS := \
 	netdevice.sh \
 	netns-name.sh \
 	netns-sysctl.sh \
+	nk_qlease.py \
 	nl_netdev.py \
 	nl_nlctrl.py \
 	pmtu.sh \