selftests: bonding: add ipvlan over bond testing

selftests: bonding: add ipvlan over bond testing

This rework bond_macvlan.sh into bond_macvlan_ipvlan.sh
We only test bridge mode for macvlan and l2 mode

]# ./bond_macvlan_ipvlan.sh
TEST: active-backup/macvlan_bridge: IPv4: client->server            [ OK ]
...
TEST: active-backup/ipvlan_l2: IPv4: client->server                 [ OK ]
...
TEST: balance-tlb/macvlan_bridge: IPv4: client->server              [ OK ]
...
TEST: balance-tlb/ipvlan_l2: IPv4: client->server                   [ OK ]
...
TEST: balance-alb/macvlan_bridge: IPv4: client->server              [ OK ]
...
TEST: balance-alb/ipvlan_l2: IPv4: client->server                   [ OK ]
...

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>
Link: https://patch.msgid.link/20250109032819.326528-3-champetier.etienne@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>