rollandf / spectrum-x-operator / 27547633824

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feat: propagate PF NO-CARRIER to VF representors (VF state follow)

When an upstream switch port goes down the PF correctly shows NO-CARRIER
but the VF representor and the VF inside the pod remain UP, causing
workloads to transmit silently into a dead uplink.

Add a background monitor (internal/vfstatefollower) that polls PF
carrier state every second via netlink OperState. When all PFs of a
RailTopology report NO-CARRIER, the active VF representors (those whose
VF is inside a pod) are set admin-down, propagating the link-down event
into the pod. Carrier recovery on any PF restores the representors.

- Add LinkSetDown and IsLinkNoCarrier to the NetlinkLib interface
- Use sriovnet to enumerate VFs and resolve representor names
- Add VFStateFollow *bool field to SpectrumXRailPoolConfigSpec
  (nil/true = enabled, &false = disabled per CR)
- Wire the monitor into the flowscontroller binary
- 15 unit tests covering carrier logic, rep state transitions,
  node selector filtering, and the VFStateFollow opt-out

Signed-off-by: Fred Rolland <frolland@nvidia.com>

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