Simplify latest state tasks stuff

The `latestStateTasks` field in the sent subscription data only ever contains 5 tasks, so we don't need to slice the array here. Also it the data ordered by most recently triggered, so don't re-sort this here.

Author: MetRonnie

src/components/cylc/TaskStateBadge.vue

@@ -29,8 +29,8 @@
       <template v-if="latestTasks.length">
         Latest:
         <span
-          v-for="(task, index) in latestTasks.slice(0, maxLatestTasks)"
-          :key="index"
+          v-for="task in latestTasks"
+          :key="task"
           class="text-grey-lighten-1"
         >
           <br/>{{ task }}

src/components/cylc/tree/GScanTreeItem.vue

@@ -130,7 +130,7 @@ function getStatesInfo (node, stateTotals = {}, latestTasks = {}) {
         latestTasks[state] = [
           ...(latestTasks[state] ?? []),
           ...nodeLatestTasks,
-        ].sort().reverse() // cycle point descending order
+        ]
       }
     }
   }