Simplify job.IsPack declaration

.changelog/23404.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+ui: added a Pack badge to the jobs index page for jobs run via Nomad Pack
+```

nomad/job_endpoint_statuses.go

@@ -6,7 +6,6 @@ package nomad
 import (
 	"errors"
 	"net/http"
-	"strings"
 	"time"
 
 	"github.com/armon/go-metrics"
@@ -199,16 +198,6 @@ func (j *Job) Statuses(
 func jobStatusesJobFromJob(ws memdb.WatchSet, store *state.StateStore, job *structs.Job) (structs.JobStatusesJob, uint64, error) {
 	highestIdx := job.ModifyIndex
 
-	isPack := false
-	if job.Meta != nil {
-		for key, value := range job.Meta {
-			if strings.HasPrefix(key, "pack") && value != "" {
-				isPack = true
-				break
-			}
-		}
-	}
-
 	jsj := structs.JobStatusesJob{
 		NamespacedID: structs.NamespacedID{
 			ID:        job.ID,
@@ -230,9 +219,10 @@ func jobStatusesJobFromJob(ws memdb.WatchSet, store *state.StateStore, job *stru
 		LatestDeployment: nil,
 		Stop:             job.Stop,
 		Status:           job.Status,
-		IsPack:           isPack,
 	}
 
+	_, jsj.IsPack = job.Meta["pack.name"]
+
 	// the GroupCountSum will map to how many allocations we expect to run
 	// (for service jobs)
 	for _, tg := range job.TaskGroups {

ui/app/routes/jobs/job.js

@@ -44,7 +44,6 @@ export default class JobRoute extends Route.extend(WithWatchers) {
         const relatedModelsQueries = [
           job.get('allocations'),
           job.get('evaluations'),
-          // this.store.query('job', { namespace, meta: true }), // TODO: I think I am probably nuking the ability to get meta:pack info here. See https://github.com/hashicorp/nomad/pull/14833
           this.store.findAll('namespace'),
         ];