Allocated Resources Shared ports dropped on inplace update

[drewbailey]

Issue

Allocations AllocatedResources shared ports are dropped on in place updates

Reproduction steps

-    service {
-      name = "example-service-1"
-      port = "api"
-    }

Job file (if appropriate)

job "example-system-job" {
  region      = "global"
  datacenters = ["dc1"]
  type        = "system"

  group "example-service-api-group" {
    count = 1

    network {
      port api {}
    }

    service {
      name = "example-service-1"
      port = "api"
    }

    service {
      name = "example-service-2"
      port = "api"
    }


    task "example-fake" {
      driver = "docker"

      config {
        image = "nicholasjackson/fake-service:v0.12.0"
      }

      env {
        LISTEN_ADDR = "0.0.0.0:${NOMAD_PORT_api}"
      }
    }
  }
}

• run job

→ curl localhost:4646/v1/allocation/016ad5ec-90bb-c27c-ba6f-e9c97e486a97 | jq '.AllocatedResources.Shared.Ports'
[
  {
    "Label": "api",
    "Value": 24383,
    "To": 0,
    "HostIP": "127.0.0.1"
  }
]

• remove one of the service blocks, run job, causing in place update

→ curl localhost:4646/v1/allocation/016ad5ec-90bb-c27c-ba6f-e9c97e486a97 | jq '.AllocatedResources.Shared.Ports'
null

Side effect first reported in #9360

[github-actions]

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