selftests/tc-testing: Create test case for UAF scenario with DRR/NETEM/BLACKHOLE chain

Create a tdc test for the UAF scenario with DRR/NETEM/BLACKHOLE chain
shared by Lion on his report [1].

[1] https://lore.kernel.org/netdev/45876f14-cf28-4177-8ead-bb769fd9e57a@gmail.com/



Signed-off-by: Victor Nogueira <victor@mojatatu.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Link: https://patch.msgid.link/20250705203638.246350-1-victor@mojatatu.com


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