Add golden files for the breakout scenario

Goldens for the two breakout scenario devices, generated against a
seeded NetBox. Both devices produce sub-port speed 100000 for the
4x100G group -- the same value whether the speed is derived from the
interface type or set explicitly in kbps.

Verified the guard by reverting the fix locally against these goldens:

  - Restoring the mixed-unit collection (explicit speed left in kbps)
    together with the downstream division turns the derived golden red
    (Ethernet0/2/4/6 speed 100000 -> 100, the customer-visible
    symptom) while the explicit golden stays green.
  - Dropping the division instead turns the explicit golden red
    (speed 100000 -> 100000000, raw kbps) while the derived golden
    stays green.

The current code keeps both green, so either regression would now
fail the E2E test with a speed diff on the affected device.

Assisted-by: Claude:claude-fable-5
Signed-off-by: Roger Luethi <luethi@osism.tech>

Author: ideaship