Backport of fix 'default' alias not added to interface specified by network_interface into release/1.6.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #18096 to be assessed for backporting due to the inclusion of the label backport/1.6.x.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

The below text is copied from the body of the original PR.

---

closes #18097

consider the following config.hcl

# config.hcl
client {
  network_interface = "tailscale0"

  host_network "tailscale" {
    interface = "tailscale0"
  }

  host_network "public" {
    interface = "wlan0"
  }
}

whenever you would schedule the following job

# job.hcl
job "docs" {
  datacenters = ["dc1"]

  group "example" {
    network {
      port "http" {}
    }
    task "server" {
      driver = "docker"

      config {
        image = "hashicorp/http-echo"
        ports = ["http"]
        args = [
          "-listen",
          ":5678",
          "-text",
          "hello world",
        ]
      }
    }
  }
}

you would see * Constraint "missing host network \"default\" for port \"http\"": 1 nodes excluded by filter because the 'default' host_network alias is being replaces with 'tailscale'. The follow PR appends the 'default' alias regardless to the addresses specified by network_interface.