ui: fix AllocationRow for job without action (#19505)

The allocation table header sometimes conditionally renders the
`Actions` table column, but the allocation row would render it
unconditionally, resulting in broken tables when rendering allocations
for jobs without actions, where rows had more columns than the header.

Also fix the conditional class for the deployments allocation table to
read `length` from the right value.

.changelog/19505.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+ui: Fix rendering of allocations table for jobs that don't have actions
+```

ui/app/templates/components/allocation-row.hbs

@@ -137,4 +137,6 @@
     @error={{this.statsError}}
   />
 </td>
-<td class="job-actions-cell" />
+{{#if this.model.job.actions.length}}
+  <td class="job-actions-cell" />
+{{/if}}

ui/app/templates/components/job-deployment/deployment-allocations.hbs

@@ -7,7 +7,7 @@
   <div class="boxed-section-head">
     Allocations
   </div>
-  <div class="boxed-section-body {{if this.job.allocations.length "is-full-bleed"}}">
+  <div class="boxed-section-body {{if @deployment.allocations.length "is-full-bleed"}}">
     {{#if @deployment.allocations.length}}
       <ListTable @source={{@deployment.allocations}} @class="allocations" as |t|>
         <t.head>