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/group-plans/taskInformation.vue

@@ -77,6 +77,7 @@
         :task-list-override="tasksByType[column]"
         :group="group"
         :search-text="searchText"
+        :draggable-override="canCreateTasks"
         @editTask="editTask"
         @loadGroupCompletedTodos="loadGroupCompletedTodos"
         @taskDestroyed="taskDestroyed"
@@ -295,7 +296,7 @@ export default {
     },
     taskCreated (task) {
       task.group.id = this.group._id;
-      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);