Fix parameterized job child meta/payload UI

[alistairking]

Disclaimer: I don't know anything about UI things.
This seems to work for me, but I'm sure there are better ways to make this fix.

Test Job

job "example" {
  datacenters = ["dc1"]
  type = "batch"

  parameterized {
    payload = "required"
    meta_optional = ["something"]
  }

  group "web" {

    network {
      mode = "bridge"
      port "www" {
        to = 8001
      }
    }

    task "http" {

      driver = "docker"

      config {
        image   = "busybox:1"
        command = "httpd"
        args    = ["-v", "-f", "-p", "8001", "-h", "/local"]
        ports   = ["www"]
      }

      dispatch_payload {
        file = "/local/text.index.html"
      }

      resources {
        cpu    = 128
        memory = 128
      }

    }
  }
}

Metadata
Previously the metadata UI bit for parameterized children was completely broken. Even jobs that did have metadata would appear to have none.
It seems that the <jobPage.ui.Meta /> component already handles non-existent metadata, so I simply dropped the (broken) checking for no metadata.

Before:

After

Payload
I think something has broken recently with https://github.com/hashicorp/nomad/blob/main/ui/app/components/job-page/parameterized-child.js such that those payload and payloadJSON attributes aren't working, but I couldn't figure out how to fix it which is why I copied the payloadJSON method into the job model -- if someone smarter than me could help me fix this properly that would be great.

[lgfa29]

Thanks for the PR @alistairking!

The meta change makes sense to me, but I'm not sure why the payload is broken. I think it may have happened during #11780 so I will ask @ChaiWithJai to take a look.

[alistairking]

@lgfa29 @ChaiWithJai any updates on this one?
I'd love to be able to see metadata on my parameterized jobs :)

[lgfa29]

@alistairking no updates yet, but we have it set for the next release 🙂

[hashicorp-cla]

All committers have signed the CLA.

[philrenaud]

Hi @alistairking, thanks for this PR. The fix in #13473 should bring the Meta and Payload sections back to parameterized child jobs, and is being backported to Nomad 1.3.x releases. I'll close out this PR as such, and thanks so much for helping us identify the issue!

[alistairking]

thanks!

[github-actions]

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