ui: List Primary and Local DCs first in the Datacenter selector (#12478)

.changelog/12478.txt

@@ -0,0 +1,3 @@
+```release-note:improvement
+ui: In the datacenter selector order Datacenters by Primary, Local then alpanumerically
+```

ui/packages/consul-ui/app/components/consul/datacenter/selector/index.hbs

@@ -4,7 +4,7 @@
 >
   <DisclosureMenu
     aria-label="Datacenter"
-    @items={{sort-by 'Name' @dcs}}
+    @items={{sort-by 'Primary:desc' 'Local:desc' 'Name:asc' @dcs}}
   as |disclosure|>
     <disclosure.Action
       {{on 'click' disclosure.toggle}}