selftests: net: exercise dev-bound cls_bpf on shared blocks

The issue:
bpf_offload.py only exercises per-device ingress qdiscs today, so neither
the shared-block accept path nor the late-join replay is tested.

The Fix:
Add a test for a device-bound SCHED_CLS program attached through a shared
block.  It loads a dev-bound SCHED_CLS program for a netdevsim device and
checks:
  - the program attaches to a shared block owned by its device, and the
    filter teardown leaves the device unloaded;
  - a block that also holds an independently backed device rejects the
    attach, because the offload path broadcasts the program to all
    members;
  - an independently backed device that joins a populated block is not
    loaded by the bind/replay path, and the driver's extack is asserted;
  - a second port of the same netdevsim device (same offload device) is
    accepted together with the bound port.

The program is loaded from the existing sample_ret0.bpf.o with an explicit
`type classifier` override, so no new sample object is needed.

Reviewed-by: Victor Nogueira <victor@mojatatu.com>
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/QDISC-PYC7.v2.20261010165947-4@mojatatu.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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