Position attribute in Interface Map may not be correct with breakout interfaces

[chrismarget-j]

https://github.com/Juniper/terraform-provider-apstra/blob/ffca27533382aff6c48229444fb61f560e0601f4/apstra/resource_interface_map.go#L548C1-L549C1

I think we're using the physical port ID here, but should be using a value which represents the logical device port.

Example weirdness:

resource "apstra_interface_map" "100x128" {
  name              = "qfx5220-32cd--128x100"
  device_profile_id = "Juniper_QFX5220-32CD_Junos"
  logical_device_id = "AOS-128x100-1"
  interfaces = [for i in range(128) :
    {
      logical_device_port     = format("1/%d", i + 1)
      physical_interface_name = format("et-0/0/%d:%d", floor(i / 4), i % 4)
      transformation_id       = 2
    }
  ]
}

I think this issue manifests itself as a cosmetic flaw in the web UI.