feat: implement task group actions

- allow sorting specifc task groups
- duplicate task group
- delete all tasks in task group

frontend/src/shared/graphql/taskGroup/deleteTaskGroupTasks.ts

@@ -0,0 +1,10 @@
+import gql from 'graphql-tag';
+
+const DELETE_TASK_GROUP_TASKS_MUTATION = gql`
+  mutation deleteTaskGroupTasks($taskGroupID: UUID!) {
+    deleteTaskGroupTasks(input: { taskGroupID: $taskGroupID }) {
+      tasks
+      taskGroupID
+    }
+  }
+`;