wicket: bgp `port` configuration is redundant with `rack_network_config.switch*.port`

The toml file that wicket takes in has a fomat that looks like this

[rack_network_config.switch0.qsfp31]
routes = [{nexthop = "198.51.103.9", destination = "0.0.0.0/0", vlan_id = 200, local_pref = 10}]
addresses = [{address = "198.51.103.10/30", vlan_id = 200}]
uplink_port_speed = "40G"
uplink_port_fec="none"
autoneg = false
bgp_peers = [
  {asn = 47, addr = "198.51.103.9", port = "qsfp31", local_pref = 20}
]

Here port = "qsfp31" is redundant with [rack_network_config.switch0.qsfp31] and introduces an opportunity for error that should not exist.

Start by tracing how wicket parses the TOML BGP peer configuration and how [rack_network_config.switch*.port] entries are represented. Determine where the redundant peer port is validated or consumed, then update the relevant behavior and tests so the configuration no longer requires this duplicated value.