Validate connect block allowed only within group.service block

[shoenig]

This job file should not pass job submission validation

job "countdash" {
  datacenters = ["dc1"]

  group "api" {
    network {
      mode = "bridge"
      port "count" {}
    }



    task "web" {
      driver = "docker"

      config {
        image = "hashicorpnomad/counter-api:v1"
      }

      service {
	name = "count-api"
	port = "count"

	# should only be valid in group level
	connect {
	  sidecar_service {}
	}
      }      
    }
  }
}

But, it currently gets submitted:

$ nomad job run example.nomad
==> Monitoring evaluation "53764f96"
    Evaluation triggered by job "countdash"
    Allocation "c717939b" created: node "2ff1b94b", group "api"
==> Monitoring evaluation "53764f96"
    Evaluation within deployment: "054604a5"
    Allocation "c717939b" status changed: "pending" -> "running" (Tasks are running)
    Evaluation status changed: "pending" -> "complete"
==> Evaluation "53764f96" finished with status "complete"

[tgross]

Closed by #9817. This will ship in Nomad 1.0.3

[github-actions]

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