[ui, deployments] Fix a bug where watchers on a parent (periodic) job would continue on a child route (#17214)

* Treated same-route as sub-route and didnt cancel watchers

* Changelog

.changelog/17214.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+ui: fixes an issue where the allocations table on child (periodic, parameterized) job pages wouldn't update when accessed via their parent
+```

ui/app/mixins/with-watchers.js

@@ -41,13 +41,16 @@ export default Mixin.create(WithVisibilityDetection, {
   actions: {
     willTransition(transition) {
       // Don't cancel watchers if transitioning into a sub-route
+      // Make sure, if it starts with the route name, that it's not the same route
       if (
         !transition.intent.name ||
-        !transition.intent.name.startsWith(this.routeName)
+        !(
+          transition.intent.name.startsWith(this.routeName) &&
+          this.routeName !== transition.intent.name
+        )
       ) {
         this.cancelAllWatchers();
       }
-
       // Bubble the action up to the application route
       return true;
     },