T5941: Migration QoS delete orphaned interface traffic-policy

We can get an orphaned interface traffic-policy when the traffic-policy
name is removed from the interface, but the node `trffic-policy`
is still attached to the interface

For exmaple we have orphaned node traffic-policy on an interface:
```
set interfaces bonding bond0 vif 995 traffic-policy
```

This causes of incorrect migration and we do not see VLANs on
the bonding interface after update.

Delete traffic-policy from all interfaces if traffic-policy does not exist

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