Drag challenge tasks (#12204)

* Allow challenge tasks to be draggable by leaders and admins

* Drag challenge tasks, ensure they're ordered

* Ensure group tasks are ordered properly, make draggable

* Add tests, fix broken tests

* Resolve merge conflict

* Remove console.log()

* Address code review comments

* Code review fixes

* Fix lint

* Fix importing

* taskManager

* Lint

* Fix collapseChecklist test

Co-authored-by: Sabe Jones <sabrecat@gmail.com>

website/client/src/components/challenges/challengeDetail.vue

@@ -133,6 +133,7 @@
           :type="column"
           :task-list-override="tasksByType[column]"
           :challenge="challenge"
+          :draggable-override="isLeader || isAdmin"
           @editTask="editTask"
           @taskDestroyed="taskDestroyed"
         />
@@ -512,7 +513,7 @@ export default {
       this.creatingTask = null;
     },
     taskCreated (task) {
-      this.tasksByType[task.type].push(task);
+      this.tasksByType[task.type].unshift(task);
     },
     taskEdited (task) {
       const index = findIndex(this.tasksByType[task.type], taskItem => taskItem._id === task._id);