selftests: fib_rule_tests: Add port mask match tests

Add tests for FIB rules that match on source and destination ports with
a mask. Test both good and bad flows.

 # ./fib_rule_tests.sh
 IPv6 FIB rule tests
 [...]
    TEST: rule6 check: sport and dport redirect to table                [ OK ]
    TEST: rule6 check: sport and dport no redirect to table             [ OK ]
    TEST: rule6 del by pref: sport and dport redirect to table          [ OK ]
    TEST: rule6 check: sport and dport range redirect to table          [ OK ]
    TEST: rule6 check: sport and dport range no redirect to table       [ OK ]
    TEST: rule6 del by pref: sport and dport range redirect to table    [ OK ]
    TEST: rule6 check: sport and dport masked redirect to table         [ OK ]
    TEST: rule6 check: sport and dport masked no redirect to table      [ OK ]
    TEST: rule6 del by pref: sport and dport masked redirect to table   [ OK ]
 [...]

 Tests passed: 292
 Tests failed:   0

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20250217134109.311176-9-idosch@nvidia.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>