Separate rejected stories from approved and pending

**IMPORTANT: please make sure you ask yourself all intro questions and fill all sections of the template.**

**Before we start...:**

- [x] I checked the documentation and didn't find this feature
- [x] I checked to make sure that this feature has not already been requested

**Branch/Commit:**

Production

**Describe the feature:**

This feature is similar to #316, but if I understood that issue right, it requests the ability to order by status, and my issue is to have rejected issues thrown to their own list to the bottom

> **As an engineer going through points stories for a roadmap**
> **I set a story status to "rejected"**
> **And I see it added to a rejected list towards the bottom, after approved and pending stories**

**Problem:**

The current problem is that, especially for projects with a lot of stories, those that were rejected pollute the list we need to go through and examine on wether the story applies or not. Having rejected stories gathered in their own list after the ones approved or awaiting examination would help with the annoying confusion of opening stories you have already looked at.

> **As a an Engineer>**
> **I want to have rejected stories apart from the other stories**
> **So that I can more easily track which stories I have researched or not**

**Mockups:**


**I will abide by the [code of conduct](https://github.com/fastruby/points/blob/main/CODE_OF_CONDUCT.md)**

先定位 story 列表和按状态排序的行为，然后将其与 issue #316 中的相关讨论以及提供的 mockup 进行比较。当标记为已拒绝的 story 出现在已批准和待处理 story 下方的独立列表中，且不影响现有的 roadmap 视图时，即视为完成。

由索引模型根据 Issue 内容生成。